Is colonoscopy dangerous? Any sequelae or side effects?

Generally speaking, electronic colonoscopy is only painful, but generally there is no danger or side effects. If you do painless colonoscopy and have anesthesia, there may be anesthesia accidents, bleeding, allergies and so on, but the possibility is very small. If you want to do it, I can give you some suggestions to reduce the pain and accidents of colonoscopy: 1, 3 days before the examination, stop taking iron drugs and start eating a semi-liquid or low-residue diet, such as fish, eggs, milk, bean products, porridge, noodles, bread, bananas, wax gourd, potatoes and so on. 2. Take laxatives the night before the examination, take magnesium sulfate or mannitol orally the next morning, and drink plenty of water. 3. If necessary, clean the intestines 2 hours before the examination and rest quietly half an hour before the examination. 4, check, the patient first take the left lateral position, abdominal relaxation, bend your knees. Change the body position according to the doctor's request during the examination. If there is any pain during the examination, tell the doctor immediately so that the doctor can insert the mirror safely. 6. Rest after inspection 1-2 days. If you have severe abdominal pain, bloating and bloody stool, you should go to the hospital immediately. 7, such as biopsy, do not do strenuous activities within 3 days after surgery. 8. Those suffering from serious heart disease, cardiopulmonary insufficiency, severe hypertension, acute diarrhea, severe ulcerative colitis, Crohn's disease of colon, peritonitis, pregnancy, mental illness, repeated abdominal operations and obvious adhesion are prohibited from doing this examination.