Andersen-Tawil Syndrome (ATS) is a rare genetic disorder characterized by a combination of physical, neurological, and cardiac abnormalities. It is caused by mutations in the KCNJ2 gene, which is responsible for the production of the potassium cha...

ANE syndrome (also known as Aicardi-Goutières Syndrome) is a rare genetic disorder that affects the brain and immune system. It is characterized by neurological problems, such as seizures, developmental delays, and intellectual disability, as wel...

What is sickle cell anemia? Sickle cell anemia (sickle cell disease) is a disorder of the blood caused by an inherited abnormal hemoglobin (the oxygen-carrying protein within the red blood cells). The abnormal hemoglobin causes distorted (...

What is sickle cell anemia? Sickle cell anemia (sickle cell disease) is a disorder of the blood caused by an inherited abnormal hemoglobin (the oxygen-carrying protein within the red blood cells). The abnormal hemoglobin causes distorted (...

Anemia of chronic disease (ACD) is a type of anemia that occurs when the body's inflammatory response to a chronic illness or infection interferes with the production of red blood cells. It is a common complication of many chronic diseases, includ...

Anemia, Hemolytic, Acquired Autoimmune is a type of anemia caused by the body's immune system attacking and destroying its own red blood cells. This type of anemia is usually caused by an autoimmune disorder, such as lupus or rheumatoid arthritis....

Anemia, Hemolytic, Cold Antibody is a type of autoimmune hemolytic anemia, which is a condition in which the body's immune system mistakenly attacks and destroys its own red blood cells. This type of anemia is caused by the production of antibodie...

Anemia, Hereditary Nonspherocytic Hemolytic (HNSH) is a type of anemia caused by a genetic defect that affects the body’s ability to produce healthy red blood cells. In this condition, red blood cells are destroyed faster than they can be replac...

Anemia, megaloblastic is a type of anemia caused by a deficiency of vitamin B12 or folate. It is characterized by the presence of large, immature red blood cells in the bloodstream. Symptoms of anemia, megaloblastic include fatigue, weakness, pale...

Anemia, Pernicious is a type of anemia caused by a lack of vitamin B12. It is caused by an inability to absorb vitamin B12 due to a lack of intrinsic factor, a protein produced in the stomach. Symptoms of Pernicious Anemia include fatigue, weaknes...

Anemias, Sideroblastic is a type of anemia caused by a defect in the production of hemoglobin, the protein in red blood cells that carries oxygen. This type of anemia is caused by a problem with the body's ability to absorb iron, which is necessar...

Anencephaly facts Anencephaly is an example of a neural tube defect, a condition that results from an error in the first weeks of embryonic development. In anencephaly, the bones of the skull and brain do not develop prope...

Anencephaly is a rare birth defect in which a baby is born without parts of the brain and skull. It is a fatal condition and most babies with anencephaly die shortly after birth....

An aneurysm is an abnormal area of localized widening of a blood vessel. The aorta bulges at the site of an aneurysm like a weak spot on a worn tire. Aortic aneurysms are typically spindle-shaped and involve the aorta belo...

An aneurysm of the sinus of Valsalva is a bulge or ballooning of the wall of one of the three sinuses of Valsalva, which are located in the heart. It is a rare condition that can cause serious complications, including aortic regurgitation, aortic ...

Aneurysm-osteoarthritis syndrome is a rare genetic disorder characterized by aneurysms (weakened and bulging blood vessels) in the brain and/or spinal cord, as well as osteoarthritis (degenerative joint disease). It is caused by a mutation in the ...