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Multiple sclerosis is a condition wherein the body's nervous system is weakened by an autoimmune reaction that attacks the myelin sheaths of neurons.
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Thyroid conditions cause a higher risk of fibromyalgia and chronic fatigue syndrome.
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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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In 1864, the first barbiturate (barbituric acid) was synthesized.
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The first documented use of surgical anesthesia in the United States was in Connecticut in 1844.