Anemia
Anemia is a condition that occurs when the amount of red blood cells or hemoglobin (the substance in the blood that carries oxygen to organs) becomes reduced, causing fatigue that can be severe.
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Anencephaly
Anencephaly is a severe congenital defect in which the fetus has no brain.
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Anesthesia
Anesthesia is the medically induced loss of sensation. General anesthesia involves the entire body; local anesthesia involves only a particular area.