Spinocerebellar ataxias. To date, researchers have identified 28 autosomal dominant ataxia genes. The first was called spinocerebellar ataxia type 1 (SCA1), with subsequent ataxia genes generally numbered according to their order of discovery. Cerebellar ataxia   more »

Ataxia describes a lack of muscle coordination when you perform voluntary movements, such as walking or picking up objects. It's a sign of an underlying condition, not a disease itself. Ataxia can affect any part of your body — affecting your movements, your   more »

Acute conditions are severe and sudden in onset. This could describe anything from a broken bone to an asthma attack. A chronic condition, by contrast is a long-developing syndrome, such as osteoporosis or asthma. Note that osteoporosis, a   more »

Anaphylaxis is a medical emergency. This serious type of allergic reaction occurs after a person is exposed to an allergen (a substance they are allergic to), such as certain foods, medications, or insect stings. The body's immune system quickly reacts, causing swelling of the face and throat, difficulty breathing   more »