It is now the season for broad beans. When we eat fresh broad beans, we should also beware of broad bean disease. Fava bean disease is an acute hemolytic anemia caused by the consumption of fresh or dried fava beans or fava bean products. The body has a substance called glucose 6 phosphate dehydrogenase (G6PD), which has a protective effect on the red blood cell membrane, and the enzyme is defective in people who eat fava beans, because the protective effect on the red blood cell membrane is weakened, resulting in the destruction of red blood cells and hemolysis. This is an intrinsic factor in the development of this disease. However, not all G6PD-deficient people develop hemolysis after eating fava beans; nor does it always occur after eating fava beans; the severity of hemolysis is not related to the amount of fava beans eaten; after the mother eats fava beans, the infant can also develop the disease by sucking its milk. All of these indicate that the occurrence of silkworm bean disease there are other yet unknown causes, pending further exploration of the medical profession. The incidence of silkworm bean disease is higher in Guangdong and Sichuan, and there are also disseminated cases in Shanghai and Jiangsu and Zhejiang. Croton disease can occur at any age, but is more common in children before the age of 10. There is often a history of illness in family members. It is common in the ripening season of broad beans every year. Patients usually have acute hemolysis, jaundice, anemia, and hemoglobinuria of varying severity in 1-2 days after eating broad beans. In severe cases, shock and acute renal failure can be life-threatening. In mild cases, the patient can gradually recover after treatment for a few days to a week or so. After eating fava beans, the above symptoms should be seen promptly.