Fitness basics
Learning Center
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.
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.
Meningitis
Spot the signs and understand the treatment options for meningitis, an infection that has several possible causes.
Medulloblastoma
Medulloblastoma is the most common cancerous brain tumor in children. Treatment usually includes a combination of surgery, radiation and chemotherapy.
Measles
Learn about this vaccine-preventable disease that used to be common in childhood and is well known for a characteristic red, splotchy rash and high fever.
Marfan syndrome
This inherited disorder affects the skeleton and the eyes. It can also harm the large blood vessel that carries blood from the heart to the rest of the body.
Male infertility
Male infertility often plays a role when couples have trouble conceiving. Find out what causes male infertility and available options for treatment.
Male hypogonadism
This condition affects the ability of men's bodies to produce enough testosterone or enough sperm or both.
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