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Learning Center
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.
Phantosmia: What causes olfactory hallucinations?
Phantosmia is often due to a head injury or upper respiratory infection.
Peritonitis
Learn about the causes, symptoms and treatment of peritonitis.
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.
Ovarian cysts and infertility: A connection?
Certain types of ovarian cysts can contribute to fertility problems.
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.
Nasopharyngeal carcinoma
Nasopharyngeal carcinoma is cancer that occurs in the nasopharynx, which is located behind your nose and above the back of your throat.
Mumps
Find out more about the symptoms and treatment of this viral illness and how vaccines can prevent it.
Mononucleosis: Can it recur?
Mono can return in some rare cases. Learn why that happens.
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