Fitness basics
Learning Center
Mumps
Find out more about the symptoms and treatment of this viral illness and how vaccines can prevent it.
Multisystem inflammatory syndrome in children (MIS-C) and COVID-19
Learn about symptoms of MIS-C, a serious condition linked to coronavirus disease 2019 (COVID-19). Get help fast if your child shows any signs.
Multiple endocrine neoplasia, type 2 (MEN 2)
Learn about this rare disorder that causes tumors and overproduction of hormones.
Moyamoya disease
This rare disorder occurs when blood flow to the brain is blocked or narrowed and a tiny cluster of blood vessels forms at the base of the brain.
Movement disorders
Learn about the different types of neurological conditions that affect movement.
Mosquito bites
Learn about the many ways to prevent mosquito bites and how to ease the itch if you are bitten.
Mononucleosis
Learn about the symptoms and treatment of the kissing disease in adults and children.
Molluscum contagiosum
Learn how to prevent and treat this common skin infection that affects people of all ages.
Mitral valve disease
Learn more about diseases that affect the valve between the left heart chambers, including mitral valve regurgitation and mitral valve stenosis.
Microcephaly
Learn more about microcephaly, when an infant's head is smaller than expected. The condition affects child development.
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