Uncooked green beans contain saponin, which has strong irritation to digestive tract mucosa; In addition, immature green beans may contain agglutinin, which has coagulation effect.
Intake of undercooked green beans can cause poisoning with a incubation period of 10 minute, usually less than 5 hours. The main symptoms are gastroenteritis, such as nausea, vomiting, abdominal pain and diarrhea. Vomiting ranges from a few times to dozens of times. There are also dizziness, headache, chest tightness, cold sweat and palpitation, and a burning sensation in the stomach. Most patients have high white blood cells and normal body temperature, and the course of disease is usually several hours or1~ 2 days.