Fiberoptic colonoscopy biopsy may have side effects such as bleeding in some patients. After colonoscopy biopsy will leave trauma on the surface of intestinal mucosa, if the trauma is large and the biopsy site is rich in blood vessels, there may be bleeding. Colonoscopy biopsy is a certain damage to the intestinal mucosa, the patient’s diet is to liquid food, you can eat some millet porridge, noodles and other food, so as to reduce the stimulation of the intestinal mucosa. After the colonoscopy, patients should pay more attention to rest, avoid excessive fatigue. Pay attention to observe the color of stool, such as bloody stool, abdominal pain and other discomforts, it is recommended to consult a doctor in a timely manner, follow the doctor’s instructions for further examination, with the help of the doctor to clarify the cause, and targeted treatment or therapy.