Hemifacial spasm is a nervous system disorder in which the muscles on one side of your face twitch involuntarily. Hemifacial spasm may be caused by a blood vessel touching a facial nerve, a facial nerve injury or a tumor, or it may not have a cause.
DEFINITION Aortic valve stenosis — or aortic stenosis — occurs when the heart’s aortic valve narrows. This narrowing prevents the valve from opening fully, which obstructs blood flow from your heart into your aorta and onward to the rest of…
DEFINITION Diabetic retinopathy (die-uh-BET-ik ret-ih-NOP-uh-thee) is a diabetes complication that affects eyes. It’s caused by damage to the blood vessels of the light-sensitive tissue at the back of the eye (retina). At first, diabetic retinopathy may cause no symptoms or…
DEFINITION Lynch syndrome is an inherited condition that increases your risk of colon cancer and other cancers. Lynch syndrome has historically been known as hereditary nonpolyposis colorectal cancer (HNPCC). A number of inherited syndromes can increase your…
DEFINITION Lymphoma is a cancer of the lymphatic system, the body’s disease-fighting network. The lymphatic system includes the lymph nodes (lymph glands), spleen, thymus gland and bone marrow. Lymphoma can affect all those areas as well as…
DEFINITION Systemic lupus erythematosus — more commonly known as lupus — is an autoimmune disease in which your immune system produces proteins called autoantibodies that attack your own tissues and organs. Some people with lupus develop a form of kidney…
