Gastric lavage should not be immediately discharged from the hospital. Clinical gastric lavage is mainly applicable to patients who have ingested poison through the mouth. After gastric lavage is given, patients with mild conditions are usually kept in the hospital for 24-48 hours for observation, and if there is no abnormality, they can be discharged from the hospital. For patients with serious illness, they need to wait until the toxins are removed from their bodies and the symptoms of poisoning have completely disappeared before they can be considered to be discharged from the hospital. The main reasons include the following three points: 1. After the poison enters the stomach, although gastric lavage is given, it can not guarantee that it will be completely cleaned up, and some poison will still be absorbed into the bloodstream through the gastrointestinal tract, and when the poisonous dose is reached, it will still cause damage to the organism. Usually, it is also necessary to give the corresponding detoxification treatment, promote excretion, protect the liver, kidneys and other organs of the treatment, but also to observe the poison on the brain, heart, liver, kidneys and other important organs whether to cause serious damage; 2, gastric lavage is an invasive operation, the gastrointestinal tract has a certain stimulation of the role of damage. Usually, patients need to be given intravenous treatment to protect the gastric mucosa after gastric lavage; 3, gastric lavage requires a large amount of gastric lavage fluid to be instilled and discharged, and patients may suffer from water-electrolyte imbalance, and some of the patients may suffer from water intoxication, cerebral edema, hypokalemia, hyponatremia, and other undesirable complications. Therefore, after gastric lavage, patients should be given a large amount of nutrients and appropriate treatment, and the body’s water-electrolyte and acid-base balance should also be monitored.