Healthy diets
Learning Center
Microcephaly
Learn more about microcephaly, when an infant's head is smaller than expected. The condition affects child development.
Mild cognitive impairment (MCI)
Learn more about this stage between the typical cognitive decline of aging and the more serious decline of dementia.
Monoclonal gammopathy of undetermined significance (MGUS)
When bone marrow produces an unusual protein in the blood, it can sometimes lead to certain types of blood cancer.
Mononucleosis: Can it recur?
Mono can return in some rare cases. Learn why that happens.
Nasopharyngeal carcinoma
Nasopharyngeal carcinoma is cancer that occurs in the nasopharynx, which is located behind your nose and above the back of your throat.
Obstructive sleep apnea
Learn the signs that point to this common and potentially serious sleep disorder. And find out the treatments that can help you sleep better.
Opioids: Safe for older people with arthritis?
Opioids aren't the first choice for a chronic condition such as arthritis. And some of their side effects may be particularly concerning for older people.
Osteomalacia
Caused by a severe vitamin D deficiency, osteomalacia softens bones, sometimes causing leg bowing in children. Boosting vitamin D intake can cure the disorder.
Osteoporosis treatment: Medications can help
Find out more about your options for bone-preserving drugs, including how often you need to take them and what side effects you might expect.
Ovarian cysts and infertility: A connection?
Certain types of ovarian cysts can contribute to fertility problems.
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