Drinking senna has side effects, mainly in the following ways: First, for the intestines are particularly prone to abdominal pain, nausea, vomiting and other symptoms, which can seriously lead to upper gastrointestinal bleeding, manifested as epigastric pain, vomiting coffee-like liquid, or tar-like stools, which mostly indicates excessive bleeding, must stop applying senna, while actively seeking medical treatment to stop bleeding. Secondly, the side effects of senna are reflected in the low blood pressure, senna can induce a rapid decrease in blood pressure and serious shock, so it should also be noted. Because many elderly people are prone to low blood pressure and the risk of death. The third point, addiction, mainly lies in the fact that many patients are too dependent on senna, which can cause severe constipation without senna.