Nutrition basics
Learning Center
Kidney stones
Learn about the symptoms, risks, causes and treatment of this often intensely painful condition.
Microcephaly
Learn more about microcephaly, when an infant's head is smaller than expected. The condition affects child development.
Narcolepsy
Learn more about this sleep disorder that causes periods of involuntary sleep, sleep paralysis and early rapid eye movement (REM) sleep.
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.
Paraneoplastic syndromes of the nervous system
This group of conditions affects people who have cancer and occurs when parts of the immune system attack parts of the nervous system.
Pericarditis
Inflammation of the tissue surrounding the heart can cause sharp chest pain and other symptoms. Know how pericarditis is diagnosed and treated.
Peritonitis
Learn about the causes, symptoms and treatment of peritonitis.
Pneumonia
Pneumonia — Learn about the symptoms, causes and treatment of this serious lung infection.
Polyhydramnios
Learn about the symptoms, causes and treatment for this condition, in which too much amniotic fluid builds up during pregnancy.
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