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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.
Acetaminophen (Tylenol) in overdose can seriously damage the liver. It should never be taken by people who use alcohol heavily; it can result in severe liver damage and even a condition requiring a liver transplant.
People about to have surgery must tell their health care providers about all supplements they take.
The most common treatment options for addiction include psychotherapy, support groups, and individual counseling.
Human kidneys will clean about 1 million gallons of blood in an average lifetime.

