caustic poisoning, the accidental ingestion of strong acids or alkalis, resulting in burns and tissue damage to the mouth, esophagus, and stomach. The victim experiences immediate pain, swelling, and edema. The pulse may be weak and rapid. Respirations become shallow, and edema may close the airway. Complications, which include circulatory shock, perforation of the esophagus, and pharyngeal edema leading to asphyxia, can be fatal. See also acid burn, alkali burn.
