• 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.

  • Anencephaly

    Anencephaly is a severe congenital defect in which the fetus has no brain.

  • Anesthesia

    Anesthesia is the medically induced loss of sensation. General anesthesia involves the entire body; local anesthesia involves only a particular area.

  • Antibiotics

    Antibiotics are drugs used to fight many infections caused by bacteria. Some antibiotics are effective against only certain types of bacteria; others can effectively fight a wide range of bacteria. Antibiotics do not work against viral infections.

  • Antibody

    An Antibody is a protein produced by white blood cells to fight bacteria, viruses, and other foreign substances.