Acid poisoning, can not use acidic gastric lavage solution for gastric lavage, such as potassium permanganate, is acidic gastric lavage solution, at this time absolutely prohibit the use of potassium permanganate gastric lavage, otherwise it will cause gastric mucous membrane burns, burns, or even the occurrence of upper gastrointestinal tract hemorrhage, resulting in adverse consequences. Acid poisoning, if it is strong acid poisoning, such as concentrated sulfuric acid, concentrated hydrochloric acid and concentrated nitric acid, gastric lavage is not allowed at this time. If gastric lavage is carried out in strong acid poisoning, it will further burn the digestive tract, leading to deformation of the esophagus and scarring contracture of the esophagus. If the strong acid poisoning, this time should be through the blood perfusion, blood purification, diarrhea and detoxification drugs symptomatic treatment and other methods, do not wash the stomach. The best liquid for gastric lavage in acid poisoning is water, and can also be performed with egg whites and milk.