Four seasons beans are a common food in life, which is rich in trace elements and dietary fiber, fried and eaten in moderation to help human health. However, if you eat the uncooked beans, it may cause human poisoning. The main content of the beans contains hemagglutinin and saponin two toxic substances, hemagglutinin has the role of blood clotting, saponin has a strong irritation of the mucous membrane, and contains the ability to destroy red blood cells hemolysin. Both must be sufficiently heated to be destroyed. If the beans are not fried and consumed, the patient ingests the toxins contained therein, and after an incubation period of 1-5 hours, discomforting symptoms such as nausea and vomiting may occur, and in severe cases, vomiting of blood may even occur due to damage to the mucous membrane of the gastrointestinal tract, and some patients may also experience diarrhea, abdominal pain, dizziness, headache, fever and other symptoms. In addition, some people may also experience electrolyte disorders such as reduced blood potassium. If the above symptoms occur after consuming string beans, consider them to be caused by undercooked string beans. In this case, the patient should immediately go to the gastroenterology department of the hospital and under the guidance of the doctor, carry out treatment such as vomiting, gastric lavage and infusion to promote the discharge of toxins. In addition, the patient should rest in bed to speed up the recovery.