Whether one is married or not, male or female, there are certain risks associated with having a colonoscopy, during which perforation and bleeding may occur, but the chances are low. Colonoscopy belongs to a kind of invasive examination, there are certain risks during the examination, the most common are intestinal perforation, bleeding, etc. If you are suffering from ulcerative colitis, it will lead to the patient’s intestinal wall being relatively thin, and the chances of perforation and bleeding are relatively high. In case of painless colonoscopy, anesthesia drugs need to be given before the colonoscopy is done, and if the patient is allergic to the anesthesia drugs, an allergic reaction will also occur. It should be noted that any examination will have corresponding risks, but colonoscopy for intestinal polyps, intestinal tumors and other diseases diagnosis, there is an important significance, so patients need to cooperate with the doctor to carry out the relevant examination, to avoid affecting the diagnosis and treatment of the disease. It is recommended that patients maintain a good mood, avoid too much tension, go to a regular hospital for colonoscopy, if found to have a disease, the need for timely treatment, so as not to delay the condition.