Nutrition basics
Learning Center
Post-vasectomy pain syndrome
Learn about post-vasectomy pain syndrome (PVPS) — How it happens after a vasectomy, tests to diagnose it and treatment options.
Polyhydramnios
Learn about the symptoms, causes and treatment for this condition, in which too much amniotic fluid builds up during pregnancy.
Pneumonia
Pneumonia — Learn about the symptoms, causes and treatment of this serious lung infection.
Plugged ears: What is the remedy?
Plugged ears are usually a mild, temporary problem. Learn about potential causes and treatments.
Pink eye (conjunctivitis)
This highly contagious eye condition can be itchy and uncomfortable. But much like the common cold, it rarely requires medicine or staying home.
Phenylalanine in diet soda: Is it harmful?
You may be worried about phenylalanine because of a warning on diet soda. Find out why the warning is there.
Phantosmia: What causes olfactory hallucinations?
Phantosmia is often due to a head injury or upper respiratory infection.
Peyronie disease
Understand what causes bent and painful erections and learn what treatments are available.
Peritonitis
Learn about the causes, symptoms and treatment of peritonitis.
Penis-enlargement products: Do they work?
Considering penis enlargement? Get the facts about male-enhancement pills, pumps, exercises and surgeries.
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