Children's health
Learning Center
Morning sickness
Learn more about nausea and vomiting during pregnancy. Learn about remedies that may help ease that queasy feeling.
Mittelschmerz
Some women experience pain on one side of the lower abdomen midway through their menstrual cycles. This cyclic pelvic pain is known as mittelschmerz.
Mitral valve disease
Learn more about diseases that affect the valve between the left heart chambers, including mitral valve regurgitation and mitral valve stenosis.
Miscarriage
Learn what might cause the loss of a pregnancy, the symptoms and how to cope.
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.
Menstrual cramps
Menstrual cramps — pain in the lower abdomen just before or during menstrual periods — can range from mild to severe. Learn about treatment options.
Menopause
Find out about this biological change and its long-term health implications — and learn how to manage bothersome hot flashes and other menopause symptoms.
Meningitis
Spot the signs and understand the treatment options for meningitis, an infection that has several possible causes.
Mastitis
Redness, pain and swelling in your breast could be mastitis — inflammation of breast tissue. Find out about mastitis symptoms, treatment and self-care.
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