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

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

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

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.

Post-thrombotic syndrome is a condition that can happen to people who have had a deep vein thrombosis (DVT) of the leg. The condition can cause chronic pain, swelling, and other symptoms in your leg. It may develop in the weeks or months following a DVT.

A seborrheic keratosis is a growth on the skin. The growth is not cancer (benign). Its color can range from white, tan, brown, or black. Seborrheic keratoses often appear on a person’s chest, arms, back, or other areas. They’re very common in people older than age 50, but younger adults can get them as well.

When you have a shoulder separation injury, trauma damages the ligaments surrounding your acromioclavicular (AC) joint. This is where your collarbone (clavicle) meets your shoulder blade (scapula). If your injury is severe, part of your shoulder blade actually separates from your collarbone.

Simple kidney cysts are fluid-filled sacs that form in your kidneys. These cysts usually don’t affect how the kidneys function.

Sixth nerve palsy occurs when the sixth cranial nerve is damaged or doesn't work right. It's also known as the abducens nerve. This condition causes problems with eye movement.