Believe me it's the colonoscopy. Gastroscopy is just that one nasty bit at the beginning when you go in the throat. Just have the nurse hold your head down and give you a little distraction. It passes in a second or two. After that it's all about the feeling in your stomach. It's not a good feeling, but it's definitely tolerable. It's just like eating too much chili makes your stomach a little hard. And now gastroscopy has internal anesthesia, so it's not as painful as the old days of stabbing down. Numbing medicine to take a minute to paralyze the entire throat, this time the saliva to spit out. Because swallowing has been paralyzed. Later, the gastroscope through the throat for a moment is like picking up the throat with a finger. And then let after is the feeling in the stomach. The colonoscopy is different. The intestines are curved, if you are not a veteran physician. Then every stab at the intestinal wall is like having someone punch you in the stomach. And it has to be pumped up, it's just not humanly possible. The worst part is that the anesthetic can't be taken internally, it can only be rubbed in. I go.