Endoscopy
The major risks are pain, bleeding, or infection. There is also a risk of perforation (tearing) of the tissue wall during endoscopy.
Reactions to the sedation can occur, although they are rare. For this reason your breathing, blood pressure, heart rate, and oxygen level will be monitored during the procedure.
Endoscopies also can be used to treat certain diseases or conditions. For example, tumors can be removed or bleeding from lesions can be stopped.