Mitral valve regurgitation is when the mitral valve in the heart is leaky. Read on to learn details about this condition, including causes, risk factors, symptoms, diagnosis, and treatment.

Microscopic polyangiitis (MPA) is a condition that causes small blood vessels to be inflamed. It's a rare type of vasculitis. The disease can damage the blood vessels and cause problems in organs around the body. Read on to learn about causes, symptoms, diagnosis, and treatment.

Medulloblastoma is a type of brain cancer. It most often affects children, but it can also happen in adults. These tumors often grow in the cerebellum, the part of the brain that controls balance and coordination.

McArdle disease is a rare muscle disorder. In McArdle disease, the muscle cells can’t effectively store energy. Read on to learn more.

A Lisfranc joint injury is a type of injury to the bones or ligaments in the middle part of your foot. In this type of injury, there also is usually damage to the cartilage covering these bones.

Lichen sclerosus is a long-term (chronic) skin condition. It causes the skin to become thin, white, and wrinkly.

Left bundle branch block is a problem with the heart’s electrical wiring (conduction) system. Read on for details about this condition.

Labyrinthitis is the inflammation of part of the inner ear called the labyrinth. The inflammation causes vertigo, hearing loss, and other symptoms.

Multiple sclerosis (MS) is a disease that interferes with your brain's ability to operate your body.

Knee pain is very common, especially in highly active people who put a lot of pressure on their knees, such as runners. Read on to learn more about this condition.