Teen health
Learning Center
Metachromatic leukodystrophy
This rare genetic disorder causes fatty substances (sulfatides) to build up in your brain and nervous system, causing progressive loss of nerve function.
Microcephaly
Learn more about microcephaly, when an infant's head is smaller than expected. The condition affects child development.
Mitral valve disease
Learn more about diseases that affect the valve between the left heart chambers, including mitral valve regurgitation and mitral valve stenosis.
Molluscum contagiosum
Learn how to prevent and treat this common skin infection that affects people of all ages.
Mosquito bites
Learn about the many ways to prevent mosquito bites and how to ease the itch if you are bitten.
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.
Multiple endocrine neoplasia, type 2 (MEN 2)
Learn about this rare disorder that causes tumors and overproduction of hormones.
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.
Myocarditis
Learn about the diagnosis and treatment of this inflammation of the heart muscle that can reduce the heart's ability to pump blood.
Neuroblastoma
Learn more about the symptoms, diagnosis and treatment of neuroblastoma, one of the most common cancers of childhood.
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