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Myositis is inflammation of muscle tissue, especially the muscles that control movement of the body. There are several types of

Mitral valve regurgitation (MR) is the leaking or backflow of blood through the valve between the upper left heart chamber (atrium

Myasthenia gravis is a rare chronic disorder that causes weakness and rapid fatigue of muscles. The muscle weakness develops

A myelogram uses X-rays (fluoroscopy) and a special dye called contrast material to make pictures of bones and nerves of the spine

Myocarditis is inflammation of the heart muscle. It may occur after an infection, such as COVID-19, strep throat, or tuberculosis

Mitral valve prolapse (MVP) is a condition that affects the mitral valve between the left upper chamber (left atrium) and left

Glaucoma is a group of eye disorders that damage the nerve at the back of the eye (optic nerve), resulting in loss of eyesight

Non-Hodgkin lymphoma (NHL) is a type of cancer that happens in your lymph system. White blood cells called lymphocytes grow

Nerve conduction studies are tests that measure how well a nerve can send an electrical signal from the spinal cord to the muscles

Some medical tests report results in nanograms (ng) per deciliter (dL). A nanogram is one-billionth of a gram. A gram is about 1