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After 5 years of being diagnosed with rheumatoid arthritis, one every three patients will no longer be able to work.
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The familiar sounds of your heart are made by the heart's valves as they open and close.
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Excessive alcohol use costs the country approximately $235 billion every year.
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Astigmatism is the most common vision problem. It may accompany nearsightedness or farsightedness. It is usually caused by an irregularly shaped cornea, but sometimes it is the result of an irregularly shaped lens. Either type can be corrected by eyeglasses, contact lenses, or refractive surgery.
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The most destructive flu epidemic of all times in recorded history occurred in 1918, with approximately 20 million deaths worldwide.