First-aid measures after food poisoning mainly include inducing vomiting and gastric lavage, diarrhea, hemodialysis and so on. 1. Emetic and gastric lavage: in the early stage of poisoning, the concentration of toxin can be diluted by taking a large amount of warm water orally; if the patient is awake, emetic can be induced by nausea triggered by stimulation of the posterior wall of the pharynx, so as to expel the toxic substances out of the body. You can also go to the hospital as soon as possible by the medical staff for gastric lavage treatment, early and effective gastric lavage can greatly improve the prognosis of poisoned patients. 2. Diarrhea: For those who have been poisoned by food for 2 hours or more, toxic substances have inevitably entered the intestinal tract. In order to minimize the absorption of the gastrointestinal tract for the poison, at this time the main focus on diarrhea, i.e., give the poisoned person to promote excretion of substances, such as 20% mannitol orally, so that the poisonous food has entered the intestine as soon as possible from the anus. 3. Hemodialysis: If the food poisoning is serious or prolonged, hemodialysis or hemofiltration can be considered to detoxify the food. It should be noted that after the first aid for food poisoning patients, we also need to give symptomatic treatment for the patient’s symptoms, such as protecting the gastric mucosa, correcting water and electrolyte disorders and other related treatments. If gastrointestinal symptoms such as bloating, abdominal pain, etc. are found after eating and do not get better after resting, go to the hospital as soon as possible and ask the professional medical staff to deal with them. Do not take medication blindly to avoid delaying your condition.