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Mumps is a contagious illness caused by a virus that infects the salivary glands, especially the parotid glands (between the ear

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

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

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

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

The normal sinus rhythm is the rhythm and rate of impulses generated by certain muscle cells as a signal to the upper heart

A neutrophil is the most common type of white blood cell, the cells that protect the body against infection by destroying bacteria

A neural tube defect (NTD) is a birth defect that occurs when the spine, the brain, or the bone and skin that protect them do not

Nystagmus is involuntary movement of the eyes. These eye movements may be slow or fast, steady or jerky, and the eyes may move

Nearsightedness is most often caused by a natural change in the shape of the eyeball that makes the eyeball too long, so that it