Teen health
Learning Center
Microcephaly
Learn more about microcephaly, when an infant's head is smaller than expected. The condition affects child development.
Mononucleosis: Can it recur?
Mono can return in some rare cases. Learn why that happens.
Mumps
Find out more about the symptoms and treatment of this viral illness and how vaccines can prevent it.
Nasopharyngeal carcinoma
Nasopharyngeal carcinoma is cancer that occurs in the nasopharynx, which is located behind your nose and above the back of your throat.
Nephrotic syndrome
Swelling around your feet and ankles is a common sign of this condition that occurs when your kidneys pass too much protein in your urine.
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.
Orchitis
This inflammation of one or both testicles can cause pain and infertility. It's usually caused by a bacterial infection or the mumps virus.
Ovarian cysts and infertility: A connection?
Certain types of ovarian cysts can contribute to fertility problems.
PSA levels: Can they rise after partial prostate removal?
A number of factors can cause PSA levels to rise after surgery for an enlarged prostate.
PSA test
Learn about this prostate cancer screening test, including why it's done, what to expect, risks and results.
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