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Avascular Necrosis

• Avascular necrosis develops when blood supply to a bone is cut off. This causes the bone to die and can cause pain and joint problems.

Autoimmune Hepatitis

• Autoimmune hepatitis is when your body’s infection-fighting system (immune system) attacks your liver cells. This causes redness and swelling (inflammation) and liver damage.

Autistic Spectrum Disorder

• Autism spectrum disorder is a neurological and developmental disorder that usually appears during the first three years of life.

Atrial Fibrillation

• Atrial fibrillation, or AFib, is a kind of abnormal heart rhythm or arrhythmia. AFib increases the risk for blood clots. These clots can then travel to the brain, causing a stroke. This is why AFib significantly increases the risk for stroke.

Attention-Deficit/Hyperactivity Disorder (ADHD) in Children

• Attention-deficit/hyperactivity disorder (ADHD) is a brain-based, or neurodevelopmental, disorder. It is often first diagnosed in childhood.

Atopic Dermatitis

• Atopic dermatitis is a chronic skin disorder. It is also called eczema. It often affects infants and may last until adulthood. It causes itchy, scaly patches on the skin.

Atherosclerosis

• Atherosclerosis is a type of thickening or hardening of the arteries caused by a buildup of plaque in the inner lining of an artery. It can increase your risk of heart attack, stroke, and other circulatory conditions.

Ataxia Telangiectasia (A-T)

• A-T is a rare childhood disease that affects the nervous system and other body systems.

Ataxia

• Ataxia means without coordination. People with ataxia lose muscle control in their arms and legs, which may lead to a lack of balance, coordination, and trouble walking. Ataxia may affect the fingers, hands, arms, legs, body, speech, and even eye movements.

Aneurysm

• An aneurysm is a bulging, weak area in the wall of a blood vessel. Learn more about this condition, including causes, risk factors, symptoms, diagnosis, and treatment.