The number of days after food poisoning is the most dangerous depends mainly on the severity of the disease and individual differences, and cannot be generalized. However, the incubation period of the disease is usually short and symptoms may appear within a few minutes to a few hours after eating. In mild cases of food poisoning, patients who have eaten small amounts of toxic food or whose food has deteriorated to a lesser extent may experience poisoning after one day, but the symptoms are mild and usually not serious and no special treatment is needed. In the case of severe food poisoning, the onset of the reaction is usually faster, and the reaction can appear in about 10 minutes. In serious cases, neurological depression can occur, leading to respiratory, circulatory and other organ failure, and the situation is the most critical at this time, so patients need to go to the hospital for emergency treatment in time. When food poisoning occurs, the patient can stimulate the pharynx to spit out the residual food in the stomach, and then drink a lot of water or light saline to promote excretion. In serious cases, some of the suspected poisoned food should be kept for diagnosis and laboratory tests.