In the clinical use of bevacizumab exactly how long will appear side effects, need to be different from person to person, there is no exact concept of time, and there is a significant difference with the patient’s physical or nutritional status. Bevacizumab, as a kind of molecular targeted drug, is a kind of monoclonal antibody, which is mainly suitable for the treatment of all kinds of colon cancer or ovarian cancer, aiming at enhancing the effect of chemotherapy, so as to achieve the purpose of prolonging the patient’s life. The side effects of Bevacizumab in clinic mainly include gastric bleeding or gastric perforation, high blood pressure, proteinuria. If any of these side effects occur, the drug should be stopped in time to avoid causing serious complications or even endangering the patient’s life. However, exactly when side effects will occur varies from person to person, and there is no exact time in the clinic. When using bevacizumab, attention should be paid to stool monitoring for early prevention of gastrointestinal bleeding, and blood pressure should be monitored from time to time to prevent life-threatening phenomena such as hypertensive crisis or hypertensive encephalopathy due to poor control of blood pressure and the combined use of bevacizumab.”