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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 B-complex vitamins and vitamin C are not stored in the body and must be replaced each day.
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Thyroid conditions cause a higher risk of fibromyalgia and chronic fatigue syndrome.
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People with high total cholesterol have about two times the risk for heart disease as people with ideal levels.
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More than 2,500 barbiturates have been synthesized. At the height of their popularity, about 50 were marketed for human use.