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Sialadenitis is an infection of the salivary glands. It is usually caused by a virus or bacteria. The parotid (in front of the ear) and submandibular (under the chin) glands are most commonly affected. Sialadenitis may be associated with pain, tenderness, redness, and gradual, localized swelling of the affected area. T...
It is important to keep a copy of your medical records to share with any new doctors that you see. This information should contain the type of cancer you were diagnosed with, test results, and treatment details. It is also essential to include information about any medical conditions, medications and supplements you ta...
Respiratory failure happens when not enough oxygen passes from your lungs into your blood. Your body's organs, such as your heart and brain, need oxygen-rich blood to work well. Respiratory failure also can happen if your lungs can't remove carbon dioxide (a waste gas) from your blood. Too much carbon dioxide in your b...
SPENCDI appears to be a rare condition, although its prevalence is unknown.
Usher syndrome is a genetic condition characterized by hearing loss or deafness, and progressive vision loss due to retinitis pigmentosa. Three major types of Usher syndrome have been described - types I, II, and III. The different types are distinguished by their severity and the age when signs and symptoms appear. A...
Certain factors affect prognosis (chance of recovery) and treatment options. The prognosis (chance of recovery) and treatment options depend on the following: - The part of the body where the tumor first formed. - The size and grade of the tumor. - The type of soft tissue sarcoma. - How deep the tumor ...
Metabolic syndrome has several causes that act together. You can control some of the causes, such as overweight and obesity, an inactive lifestyle, and insulin resistance. You can't control other factors that may play a role in causing metabolic syndrome, such as growing older. Your risk for metabolic ...
Bethlem myopathy is an inherited movement disorder characterized by progressive muscle weakness and joint stiffness (contractures) in the fingers, wrists, elbows, and ankles. Due to a progressive course, up to two-thirds of people with this condition require a walker or wheelchair after the age of 50. Bethlem myopathy ...
A prolactinoma is a tumor of the pituitary gland, which controls production of many hormones. A prolactinoma causes increased levels of the hormone prolactin. The symptoms of prolactinoma may include unusual milk production (galactorrhea) or no menstrual cycles (amenorrhea) in women or decreased sex drive in men. Mo...
This condition is inherited in an X-linked recessive pattern. The gene associated with this condition is located on the X chromosome, which is one of the two sex chromosomes. In males (who have only one X chromosome), one altered copy of the gene in each cell is sufficient to cause the condition. In females (who have t...
Disseminated peritoneal leiomyomatosis (DPL) is a rare condition which is characterized by nodules or small lumps of smooth muscle cells located on the peritoneum (lining of the abdominal wall) and abdominal organs.The condition is usually benign (noncancerous) but in rare cases has become cancerous. Although it can be...
What are the signs and symptoms of Hepatocellular carcinoma, childhood? The Human Phenotype Ontology provides the following list of signs and symptoms for Hepatocellular carcinoma, childhood. If the information is available, the table below includes how often the symptom is seen in people with this condition. You can u...
These resources address the diagnosis or management of primary myelofibrosis: - Genetic Testing Registry: Myelofibrosis - Merck Manual Professional Version: Primary Myelofibrosis - Myeloproliferative Neoplasm (MPN) Research Foundation: Primary Myelofibrosis (PMF) These resources from MedlinePlus offer information ...
How might dermatitis herpetiformis be treated? The antibiotic dapsone is extremely effective in treating this condition. Symptomatic improvement may occur in as little as several hours after the first dose. However, dapsone may cause serious side effects and requires regular monitoring by a physician. When this medicat...
The mission of the National Institute of Neurological Disorders and Stroke (NINDS) is to seek fundamental knowledge of the brain and nervous system and to use that knowledge to reduce the burden of neurological disease. The NINDS is a component of the National Institutes of Health, the leading supporter of biomedical r...
Adolescent idiopathic scoliosis is an abnormal curvature of the spine that appears in late childhood or adolescence. Instead of growing straight, the spine develops a side-to-side curvature, usually in an elongated "S" or "C" shape; the bones of the spine are also slightly twisted or rotated. Adolescent idiopathic sco...
Potocki-Shaffer syndrome is a disorder that affects development of the bones, nerve cells in the brain, and other tissues. Most people with this condition have multiple noncancerous (benign) bone tumors called osteochondromas. In rare instances, these tumors become cancerous. People with Potocki-Shaffer syndrome also h...
The National Institute of Neurological Disorders and Stroke (NINDS) and other institutes of the National Institutes of Health (NIH) conduct research relating to CRPS and also support additional research through grants to major medical institutions across the country. NINDS-supported scientists are studying new approach...
How might congenital sucrase-isomaltase deficiency (CSID) be treated? CSID is typically treated by modifying a person's diet to reduce the amount of sucrose. Because many foods contain sucrose and other complex sugars, it can be difficult to completely remove sucrase from the diet. Sucraid is an oral medication contain...
RAPADILINO syndrome is a rare condition, although its worldwide prevalence is unknown. The condition was first identified in Finland, where it affects an estimated 1 in 75,000 individuals, although it has since been found in other regions.
Waldenstrm macroglobulinemia is usually not inherited, and most affected people have no history of the disorder in their family. The condition usually arises from mutations that are acquired during a person's lifetime (somatic mutations), which are not inherited. Some families seem to have a predisposition to the cond...
Chromosome 6p deletion is a chromosome abnormality that occurs when there is a missing copy of the genetic material located on the short arm (p) of chromosome 6. The severity of the condition and the signs and symptoms depend on the size and location of the deletion and which genes are involved. Features that often occ...
These resources address the diagnosis or management of Schimke immuno-osseous dysplasia: - Gene Review: Gene Review: Schimke Immunoosseous Dysplasia - Genetic Testing Registry: Schimke immunoosseous dysplasia These resources from MedlinePlus offer information about the diagnosis and management of various health con...
Learning disabilities are disorders that affect the ability to understand or use spoken or written language, do mathematical calculations, coordinate movements, or direct attention. Although learning disabilities occur in very young children, the disorders are usually not recognized until the child reaches school age. ...
These resources address the diagnosis or management of gnathodiaphyseal dysplasia: - Cleveland Clinic: Osteomyelitis - MedlinePlus Encyclopedia: Bone Mineral Density Testing These resources from MedlinePlus offer information about the diagnosis and management of various health conditions: - Diagnostic Tests - Dru...
These resources address the diagnosis or management of Kniest dysplasia: - Genetic Testing Registry: Kniest dysplasia - MedlinePlus Encyclopedia: Clubfoot - MedlinePlus Encyclopedia: Retinal Detachment - MedlinePlus Encyclopedia: Scoliosis These resources from MedlinePlus offer information about the diagnosis and...
These resources address the diagnosis or management of ocular albinism: - Gene Review: Gene Review: Ocular Albinism, X-Linked - Genetic Testing Registry: Albinism ocular late onset sensorineural deafness - Genetic Testing Registry: Albinism, ocular, with sensorineural deafness - Genetic Testing Registry: Ocular alb...
- Autoimmune hepatitis is a chronicor long lastingdisease in which the body's immune system attacks the liver and causes inflammation and damage. - Autoimmune hepatitis is a serious condition that may worsen over time if not treated. Autoimmune hepatitis can lead to cirrhosis and liver failure. - Autoimmune hepatitis...
People with diverticulitis may have many symptoms, the most common of which is pain in the lower left side of the abdomen. The pain is usually severe and comes on suddenly, though it can also be mild and then worsen over several days. The intensity of the pain can fluctuate. Diverticulitis may also cause ...
What causes florid cemento-osseous dysplasia? The cause of florid cemento-osseous dysplasia is not known. This condition is usually not familial (i.e., does not tend to run in families), however a rare familial form has been described in a few families. In these families the condition affected younger individuals, and ...
These resources address the diagnosis or management of anencephaly: - Children's Hospital of Philadelphia - Genetic Testing Registry: Anencephalus - Genetic Testing Registry: Neural tube defect - Genetic Testing Registry: Neural tube defects, folate-sensitive These resources from MedlinePlus offer information abo...
An accessory navicular bone is a small bone located in the middle of the foot. It is near the navicular bone, the bone that goes across the foot near the instep. It is a common trait, estimated to be in approximately 2 to 12% of the general population and up to 14% of children. This bone may develop a bump that can cau...
This condition is inherited in an X-linked pattern. A condition is considered X-linked if the mutated gene that causes the disorder is located on the X chromosome, one of the two sex chromosomes. In males (who have only one X chromosome), one altered copy of the gene in each cell is sufficient to cause the condition. I...
Smoking cigarettes has many health risks for everyone. However, the younger you are when you start smoking, the more problems it can cause. People who start smoking before the age of 21 have the hardest time quitting. Teens who smoke are also more likely to use alcohol and illegal drugs. The problem is not just ciga...
What are the signs and symptoms of pars planitis? Pars planitis is characterized by inflammation of the narrowed area (pars plana) between the colored part of the eye (iris) and the choroid. This may lead to blurred vision; dark, floating spots in the vision; and progressive vision loss. Approximately 80% of cases are ...
What are the signs and symptoms of Uhl anomaly? The Human Phenotype Ontology provides the following list of signs and symptoms for Uhl anomaly. If the information is available, the table below includes how often the symptom is seen in people with this condition. You can use the MedlinePlus Medical Dictionary to look up...
What are the signs and symptoms of Hepatoblastoma? The Human Phenotype Ontology provides the following list of signs and symptoms for Hepatoblastoma. If the information is available, the table below includes how often the symptom is seen in people with this condition. You can use the MedlinePlus Medical Dictionary to l...
Perry syndrome results from mutations in the DCTN1 gene. This gene provides instructions for making a protein called dynactin-1, which is involved in the transport of materials within cells. To move materials, dynactin-1 interacts with other proteins and with a track-like system of small tubes called microtubules. Thes...
How might Gorham disease be treated? No specific therapy exists for people with Gorham's disease. Certain treatments may be effective in some, but not others. Several different methods are often used before finding one that is effective. In some cases, treatment may not be necessary. Most people require intense treatme...
Myotonia is a medical term that refers to a neuromuscular condition in which the relaxation of a muscle is impaired. It can affect any muscle group. Repeated effort will be needed to relax the muscle, although the condition usually improves after the muscles have warmed-up. Individuals with myotonia may have trouble re...
These resources address the diagnosis or management of Brooke-Spiegler syndrome: - Genetic Testing Registry: Spiegler-Brooke syndrome These resources from MedlinePlus offer information about the diagnosis and management of various health conditions: - Diagnostic Tests - Drug Therapy - Surgery and Rehabilitation ...
Geroderma osteodysplastica is an autosomal recessive disorder characterized by lax, wrinkled skin, loose joints and a typical face with a prematurely aged appearance. Skeletal signs include severe osteoporosis leading to frequent fractures, malar and mandibular hypoplasia (underdeveloped cheekbones and jaw) and a varia...
How is dentatorubral-pallidoluysian atrophy (DRPLA) inherited?
DICER1 syndrome is caused by mutations in the DICER1 gene. This gene provides instructions for making a protein that is involved in the production of molecules called microRNA (miRNA). MicroRNA is a type of RNA, a chemical cousin of DNA, that attaches to a protein's blueprint (a molecule called messenger RNA) and block...
Infantile-onset ascending hereditary spastic paralysis is a motor neuron disease characterized by progressive weakness and stiffness of muscles in the arms, legs, and face. Initial symptoms usually occur within the first 2 years of life and include weakness of the legs, leg muscles that are abnormally tight and stiff, ...
These resources address the diagnosis or management of X-linked adrenoleukodystrophy: - Gene Review: Gene Review: X-Linked Adrenoleukodystrophy - Genetic Testing Registry: Adrenoleukodystrophy - Genomics Education Programme (UK) - MedlinePlus Encyclopedia: Adrenoleukodystrophy - National Marrow Donor Program - X-...
How might non-involuting congenital hemangioma treated? Because non-involuting congenital hemangioma (NICH) is quite rare, there are no established guidelines for the treatment of this condition. However, the authors of one article on NICH suggest that there is no risk for excessive bleeding during the removal of an N...
These resources address the diagnosis or management of thiopurine S-methyltransferase deficiency: - MedlinePlus Drug: Azathioprine - MedlinePlus Drug: Mercaptopurine - MedlinePlus Drug: Thioguanine These resources from MedlinePlus offer information about the diagnosis and management of various health conditions: ...
The prevalence of deoxyguanosine kinase deficiency is unknown. Approximately 100 affected individuals have been identified.
How might trismus-pseudocamptodactyly syndrome be treated? While the best treatment options for trismus-pseudocamptodactyly syndrome have not been well established cases of improvement of mouth mobility following surgery and physical therapy have been reported in the medical literature. We recommend that you speak with...
The mission of the National Institute of Neurological Disorders and Stroke (NINDS) is to seek fundamental knowledge about the brain and nervous system and to use that knowledge to reduce the burden of neurological disease. The NINDS is a part of the National Institutes of Health (NIH), the leading supporter of biomedic...
Dicarboxylic aminoaciduria is a rare metabolic disorder characterized by the excessive loss of aspartate and glutamate in urine. Symptoms have varied greatly among the few reported cases. Dicarboxylic aminoaciduria is caused by mutations in the SLC1A1 gene. It is inherited in an autosomal recessive fashion.
Christianson syndrome is a rare condition, although the exact prevalence is unknown. The condition was first described in a South African family and has since been found people in other parts of the world.
This condition is inherited in an autosomal recessive pattern, which means both copies of the gene in each cell have mutations. The parents of an individual with an autosomal recessive condition each carry one copy of the mutated gene, but they typically do not show signs and symptoms of the condition.
Mutations in the IVD gene cause isovaleric acidemia. The IVD gene provides instructions for making an enzyme that plays an essential role in breaking down proteins from the diet. Specifically, this enzyme helps process the amino acid leucine, which is part of many proteins. If a mutation in the IVD gene reduces or eli...
What causes Bethlem myopathy? Bethlem myopathy is caused by mutations in the COL6A1, COL6A2, and COL6A3 genes. These genes each provide instructions for making one component of a protein called type VI collagen. This protein plays an important role in muscle, particularly skeletal muscle. Type VI collagen makes up part...
There is no specific treatmentfor OPCA. Physicians may try different medications to treat the ataxia, tremor, and rigidity that are associated with the disorder. Other treatments are directed at specific symptoms. Stiffness, spasms, sleep disorders, depression, and tremor may be improved with medication. A physical the...
Beta thalassemia is a fairly common blood disorder worldwide. Thousands of infants with beta thalassemia are born each year. Beta thalassemia occurs most frequently in people from Mediterranean countries, North Africa, the Middle East, India, Central Asia, and Southeast Asia.
Summary : Traveling can increase your chances of getting sick. A long flight can increase your risk for deep vein thrombosis. Once you arrive, it takes time to adjust to the water, food, and air in another place. Water in developing countries can contain viruses, bacteria, and parasites that cause stomach upset and dia...
How is achalasia diagnosed? Achalasia is suspected in individuals with dysphagia (difficulty swallowing) and in instances where regurgitation symptoms are not responsive to protein pump inhibitor medication. The diagnosis of achalasia is confirmed by manometry (test that measures how well the esophagus is working); ho...
This condition is inherited in an autosomal dominant pattern, which means one copy of the altered gene in each cell is sufficient to cause the disorder.
FIPA is inherited in an autosomal dominant pattern, which means one copy of the altered gene in each cell is sufficient to cause the disorder. However, only 20 to 30 percent of individuals with an AIP gene mutation develop a pituitary adenoma. This phenomenon, in which some individuals with a mutation do not develop th...
Is genetic testing available for Buschke Ollendorff syndrome? Yes. GeneTests lists the names of laboratories that are performing genetic testing for Buschke Ollendorff syndrome. To view the contact information for the clinical laboratories conducting testing, click here. Please note: Most of the laboratories listed thr...
This condition is inherited in an X-linked recessive pattern. The NYX and CACNA1F genes are located on the X chromosome, which is one of the two sex chromosomes. In males (who have only one X chromosome), one altered copy of the gene in each cell is sufficient to cause the condition. In females (who have two X chromoso...
Frequently Asked Queestions (FAQs)
How is sideroblastic anemia diagnosed? The principle feature of sideroblastic anemia is slowly progressive, mild, life-long anemia which often goes unnoticed. Symptoms of iron overload may lead to the discovery of this underlying disorder. The history and clinical findings, together with laboratory findings, usually pe...
These resources address the diagnosis or management of Huntington disease-like syndrome: - Gene Review: Gene Review: Huntington Disease-Like 2 - Gene Review: Gene Review: Spinocerebellar Ataxia Type 17 - Genetic Testing Registry: Huntington disease-like 1 - Genetic Testing Registry: Huntington disease-like 2 - Gen...
Lichen planus pigmentosus (LPP) is a rare form of lichen planus. It is characterized by oval or irregularly shaped brown to gray-brown macules and patches on the skin. Areas that are exposed to sun such as the forehead, temples and neck are most commonly affected. However, the macules and patches may also develop on th...
This condition is inherited in an autosomal recessive pattern, which means both copies of the gene in each cell have mutations. The parents of an individual with an autosomal recessive condition each carry one copy of the mutated gene, but they typically do not show signs and symptoms of the condition.
If you smoke cigarettes, you are at much higher risk for lung cancer than a person who has never smoked. The risk of dying from lung cancer is 23 times higher for men who smoke and 13 times higher for women who smoke than for people who have never smoked. Stopping smoking greatly reduces your risk for developing lung c...
What are the signs and symptoms of Hemangiopericytoma? The Human Phenotype Ontology provides the following list of signs and symptoms for Hemangiopericytoma. If the information is available, the table below includes how often the symptom is seen in people with this condition. You can use the MedlinePlus Medical Diction...
How is alpha-thalassemia x-linked intellectual disability syndrome inherited? Alpha-thalassemia x-linked intellectual disability (ATRX) syndrome is caused by a mutation in the ATRX gene and is inherited in an x-linked way. The chance that a relative may have ATRX syndrome depends on whether the mutation in the first a...
The prognosis for lupus varies widely depending on the organs involved and the intensity of the inflammatory reaction. The course of lupus is commonly chronic and relapsing, often with long periods of remission. Most individuals with lupus do not develop serious health problems and have a normal lifespan with periodic ...
How is Langerhans cell histiocytosis diagnosed? Testing for Langerhans cell histiocytosis (LCH) may include bronchoscopy with biopsy, x-ray, skin biopsy, bone marrow biopsy, complete blood count, and pulmonary function tests. Because LCH is sometimes associated with cancer, CT scans and a biopsy may be done to rule out...
This condition is inherited in an autosomal recessive pattern, which means both copies of the gene in each cell have mutations. The parents of an individual with an autosomal recessive condition each carry one copy of the mutated gene, but they typically do not show signs and symptoms of the condition.
Paresthesia refers to a burning or prickling sensation that is usually felt in the hands, arms, legs, or feet, but can also occur in other parts of the body. The sensation, which happens without warning, is usually painless and described as tingling or numbness, skin crawling, or itching. Most people have experienced ...
These resources address the diagnosis or management of amelogenesis imperfecta: - Genetic Testing Registry: Amelogenesis imperfecta - hypoplastic autosomal dominant - local - Genetic Testing Registry: Amelogenesis imperfecta, hypocalcification type - Genetic Testing Registry: Amelogenesis imperfecta, type 1E - Gene...
Alpha-methylacyl-CoA racemase (AMACR) deficiency is a disorder that causes a variety of neurological problems that begin in adulthood and slowly get worse. People with AMACR deficiency may have a gradual loss in intellectual functioning (cognitive decline), seizures, and migraines. They may also have acute episodes of ...
Is frontal fibrosing alopecia inherited? Frontal fibrosing alopecia is not thought to be inherited in most cases. It rarely affects more than one person in a family.
This condition is inherited in an autosomal recessive pattern, which means both copies of the gene in each cell have mutations. The parents of an individual with an autosomal recessive condition each carry one copy of the mutated gene, but they typically do not show signs and symptoms of the condition.
These resources address the diagnosis or management of 48,XXYY syndrome: - Genetic Testing Registry: XXYY syndrome These resources from MedlinePlus offer information about the diagnosis and management of various health conditions: - Diagnostic Tests - Drug Therapy - Surgery and Rehabilitation - Genetic Counselin...
These resources address the diagnosis or management of giant congenital melanocytic nevus: - Cleveland Clinic: The Facts About Melanoma - Genetic Testing Registry: Giant pigmented hairy nevus - MedlinePlus Encyclopedia: Giant Congenital Nevus - Nevus Outreach: Treatment Options - Primary Care Dermatology Society ...
Treatment for Joubert syndrome is symptomatic and supportive. Infant stimulation and physical, occupational, and speech therapy may benefit some children. Infants with abnormal breathing patterns should be monitored. Screening for progressive eye, liver, and kidney complications associated with Joubert-related disorder...
Hidradenitis suppurativa, also known as acne inversa, is a chronic skin disease characterized by recurrent boil-like lumps (nodules) under the skin. The nodules become inflamed and painful. They tend to break open (rupture), causing abscesses that drain fluid and pus. As the abscesses heal, they produce significant sca...
What causes mucopolysaccharidosis I (MPS I)? Mutations in the IDUA gene cause MPS I. The IDUA gene provides instructions for producing an enzyme that is involved in the breakdown of large sugar molecules called glycosaminoglycans (GAGs). Mutations in the IDUA gene reduce or completely eliminate the function of the IDUA...
Most cases of adiposis dolorosa are sporadic, which means they occur in people with no history of the disorder in their family. A small number of familial cases of adiposis dolorosa have been reported. When the condition runs in families, it appears to have an autosomal dominant pattern of inheritance because affected...
There is no cure for Rett syndrome. Treatment for the disorder is symptomatic, focusing on the management of symptoms, and supportive. Medication may be needed for breathing irregularities and motor difficulties, and antiepileptic drugs may be used to control seizures. Occupational therapy, physiotherapy, and hydrother...
Sideroblastic anemia is a heterogeneous group of blood disorders characterized by an impaired ability of the bone marrow to produce normal red blood cells. The iron inside red blood cells is inadequately used to make hemoglobin, despite adequate or increased amounts of iron. Abnormal red blood cells called sideroblasts...
Joubert syndrome is estimated to affect between 1 in 80,000 and 1 in 100,000 newborns. However, this estimate may be too low because Joubert syndrome has such a large range of possible features and is likely underdiagnosed.
Nearly 18 million U.S. adultsabout one in 12have fecal incontinence.1 People of any age can have a bowel control problem, though fecal incontinence is more common in older adults. Fecal incontinence is slightly more common among women. Having any of the following can increase the risk: - diarrhea, whic...
Short bowel syndrome is a group of problems related to poor absorption of nutrients. Short bowel syndrome typically occurs in people who have - had at least half of their small intestine removed and sometimes all or part of their large intestine removed - significant damage of the small intestine - p...
The prevalence of gnathodiaphyseal dysplasia is unknown, but it is thought to be a rare disorder. A few affected individuals and families have been described in the medical literature.
The incidence of hereditary multiple osteochondromas is estimated to be 1 in 50,000 individuals. This condition occurs more frequently in some isolated populations: the incidence is approximately 1 in 1,000 in the Chamorro population of Guam and 1 in 77 in the Ojibway Indian population of Manitoba, Canada.
How is situs inversus diagnosed? A thorough physical examination, followed by radiographic imaging of the chest and abdomen and electrocardiography, identify most cases of situs inversus. The main diagnostic challenge in affected people is the non-traditional presence of referred pain (pain felt in a different location...
Signs and symptoms of hairy cell leukemia include infections, tiredness, and pain below the ribs. These and other signs and symptoms may be caused by hairy cell leukemia or by other conditions. Check with your doctor if you have any of the following: - Weakness or feeling tired. - Fever or frequent infecti...
What causes fragile X syndrome? Mutations (changes) in the FMR1 gene cause fragile X syndrome (FXS). This gene carries instructions to make a protein called the fragile X mental retardation 1 protein. The FMR1 gene contains a section of DNA called a CGG triplet repeat, which normally repeats from 5 to around 40 times. ...
Koolen de Vries syndrome, formerly known as 17q21.31 microdeletion syndrome, is a condition caused by a small deletion of genetic material from chromosome 17. The deletion occurs at a location designated as q21.31. People with 17q21.31 microdeletion syndrome may have developmental delay, intellectual disability, seizur...
Congenital hyperinsulinism affects approximately 1 in 50,000 newborns. This condition is more common in certain populations, affecting up to 1 in 2,500 newborns.
Ataxia neuropathy spectrum is caused by mutations in the POLG gene or, rarely, the C10orf2 gene. The POLG gene provides instructions for making one part, the alpha subunit, of a protein called polymerase gamma (pol ). The C10orf2 gene provides instructions for making a protein called Twinkle. Pol and Twinkle function...
Coronary artery disease (CAD) is the most common type of heart disease. It is the leading cause of death in the United States in both men and women. CAD happens when the arteries that supply blood to heart muscle become hardened and narrowed. This is due to the buildup of cholesterol and other material, called plaqu...