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A mononucleosis spot test (rapid mono test) is a screening test for mononucleosis. The test detects a type of antibody (heterophil

Morning sickness is nausea, sometimes with vomiting, likely caused by hormones released during pregnancy. Morning sickness occurs

Multiple sclerosis (MS) is a disease that affects the central nervous system—the brain and spinal cord. It also affects the nerves

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

Medicines you can buy without a prescription are called nonprescription or over-the-counter (OTC) medicines. They may be taken to