Hi, thanks for using Healthcare Magic. I understand your concern. Almost every procedure had side effects, and I think your condition is correlated with the history of endoscopy. Endoscopy is the act of inserting binoculars into the gastrointestinal tract for both therapy and diagnostic purposes. Basically, an endoscopic action is a very safe and very rarely complicated action. In the endoscopic action of the upper gastrointestinal tract (mouth) in some people can cause a sore throat and flatulence, but these symptoms will usually disappear by itself. Some other rare complication risks are: 1. Reaction to treatment, at certain endoscopic measures there are several treatments that are performed during the action. Make sure you consult a doctor who takes action on any medication that may be given 2. Bleeding may occur when the endoscopy is performed while performing a biopsy 3. Infection, endoscopic action always using sterile tools, on the possibility of infection of the doctor who performs the action usually has given antibiotics prevention To reduce the likelihood of these risks, you should follow the doctor s recommended course of action such as fasting time and other things. I hope this helps. Take care.