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Behcet disease is a type of autoimmune disease. It causes inflammation of blood vessels. It’s a rare disease in the United States, but it is more common in the Middle East and Asia. It’s more common in people in their 20s to 40s, but it can happen at any age.

A brain cyst is a fluid-filled sac in the brain. They can be noncancer (benign) or cancer (malignant).

Brown syndrome is a rare disorder that limits the eye's normal movements. Here's what you need to know.

Carnitine palmitoyltransferase (CPT) deficiency is a very rare condition that causes muscle weakness and other symptoms. It happens because of a problem with one of two enzymes, CPT1 or CPT2. Enzymes are substances in the body that help cause chemical reactions.

A carotid dissection is a type of tear in 1 of your carotid arteries. It is a common cause of stroke in people younger than age 50.

Catecholaminergic polymorphic ventricular tachycardia, or CPVT, is a rare genetic condition. It causes an irregular heart rhythm that can be life-threatening. It often shows up in childhood. Often the first sign is fainting or near fainting during exercise or strong emotion. Read on to learn more.

Choroid plexus papilloma (CPP) is a rare type of brain tumor. These tumors are usually not cancerous. This condition is most common in young children, but it can also occur in adults.

Digital eye strain is a group of eye and vision problems related to extended computer use.

Convergence insufficiency (CI) is when the eyes have trouble working together while focusing on an object at that is close by. Here are some key points about the condition.