Relapsing-remitting multiple sclerosis (MS) is a type of multiple sclerosis that causes flare-ups with periods of remission in between. Most people diagnosed with MS start off with this type.

An eye twitch is an involuntary, abnormal blinking of your eyelid. This abnormal blinking may happen many times per day. If eye twitching is severe, it can impair vision.

Ependymoma is a rare type of tumor of the brain or spinal cord. It can happen in both children and adults. In children, these tumors tend to be in the brain. In adults, they are often in the spinal cord.

When something goes wrong with the muscles that direct swallowing, it's called dysphagia.

Dyshidrotic eczema is an ongoing (chronic) skin condition. It causes a burning, itching feeling. Severe cases may also cause a blistering rash.

Learn about dilated cardiomyopathy, including causes, risks, symptoms, diagnosis, treatment, and prevention.

Learn about diabetic ketoacidosis (DKA), a serious condition that can happen to some people with diabetes.

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.

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.

As HIV and AIDS battle your immune system, your central nervous system is also affected. HIV and AIDS both cause many neurological complications, particularly if HIV goes untreated and is allowed to progress to AIDS.