Neuromyelitis optica (NMO) is a rare autoimmune disease that affects the central nervous system.

A seizure that lasts at least 30 minutes is called status epilepticus, or a prolonged seizure. This is a medical emergency that may lead to lasting brain damage or death. Read this to learn more about status epilepticus.

Carcinoid tumor is a rare type of tumor that grows slowly.

People who have AIDS are much more likely to get certain types of cancer than people without the disease.

Brachial neuritis is nerve damage that affects the chest, shoulder, arm, and hand. It causes pain, weakness and lack of muscle control and lack of feeling in the shoulder or arm.

An epidural abscess is an infection that forms in the space between your skull bones and your brain lining (intracranial epidural abscess).

Bacterial meningitis is an infection of the membranes that protect the spinal cord and brain. Learn more about this condition, including cause, symptoms, diagnosis, and treatment.

Zika is a virus passed on through the bite of a mosquito. It may also be spread through sexual contact and blood transfusions.

Transverse myelitis is inflammation and scarring of the spinal cord that causes pain and weakness in the body.

Borderline personality disorder (BPD) is a kind of mental health problem. People with BPD have unstable moods and can act recklessly. They also have a hard time managing their emotions. Read on to learn more.