As with all surgeries, endoscopy involves risks and the possible complications. Complications are uncommon but may become serious and life threatening in some cases. Complications can develop during surgery or recovery. General risks of endoscopy Complications of endoscopy include: Adverse reaction or problems related to sedation or medications, such as an allergic reaction and problems with breathing Bleeding Infection Pain Perforation or tear of the local tissue Potential complications of specific endoscopy procedures Potential complications are related to the type of endoscopy: Arthroscopy can result in blood clots, severe swelling of the joint, and nerve or blood vessel damage. Bronchoscopy can result in sore throat, hoarseness, fever, pneumonia, and pneumothorax (collapsed lung). Colonoscopy and sigmoidoscopy can result in nausea, vomiting, rectal discomfort, bloating, puncture of the large intestine, bleeding, and dehydration due to taking enemas and laxatives before the procedure. Cystoscopy and ureteroscopy can result in bloody urine and urinary tract infection. Laparoscopy can result in blood vessel or organ damage, which may require further surgical repair. Upper gastrointestinal endoscopy can result in puncture of the upper gastrointestinal tract, difficulty swallowing, bleeding, and sore throat. Reducing your risk of complications You can reduce the risk of some complications by following your treatment plan and: Following activity, dietary and lifestyle restrictions and recommendations before your procedure and during your recovery Notifying your doctor immediately of any concerns, such as bleeding, fever, or increase in pain Taking your medications exactly as directed Telling all members of your care team if you have any allergies