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

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

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

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

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.

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.

Nasal polyps are abnormal, soft, swollen, sac-like growths of inflamed tissue. They line the inside of your nose or your sinuses.

Neurogenic bowel is the loss of normal bowel function. It’s caused by a nerve problem. Here's what you need to know about this condition.

Neuronal and mixed neuronal-glial tumors are a group of rare tumors that occur in the brain or spinal cord.