The main hazard of capsule endoscopy is that during the procedure, the capsule endoscope may become embedded in a part of the GI tract and cannot be expelled from the body. The most common cause of this consequence is the formation of a niche in the digestive tract in patients with inflammation or ulcers, obstruction or bleeding in the digestive tract, where the capsule endoscope becomes embedded and cannot come out. Another common cause is a congenital malformation of the GI tract, resulting in too many GI strictures and the possibility of the capsule endoscope becoming embedded at one point. Chronic inflammation of the GI tract, tumors of the GI tract, and compression of the GI tract by tumors outside the GI tract can all cause narrowing of the GI tract lumen, which can lead to capsule endoscope imbedding. After the capsule endoscope enters the body, it usually takes 2-3 days to expel and needs to be closely monitored.