According to what the original poster said:

Colonoscopy: The preliminary preparations are a bit uncomfortable because you have to drink laxatives and have constant diarrhea until it becomes watery. When the photo was taken, the tube was inserted through the anus, and I felt a lot of gas in my stomach. I felt less pain, and it hurt slightly when the tube turned. The whole process takes 5 to 10 minutes and feels bearable. I can talk while taking photos. Mental clarity.

Gastroscopy: No preliminary preparation is required, you can do it as you go, as long as you don’t eat breakfast (usually done in the morning). When the tube was inserted through the mouth, I felt nauseous, queasy (like picking my throat with chopsticks), and salivation increased. The pain is less felt, just uncomfortable. The whole process takes 5 to 10 minutes and feels bearable. I can't talk at all times. Mental clarity.

To sum up: gastroscopy is uncomfortable, both have painless options, which cost about 300 yuan more, and are only partially anesthetized. Personally, I don’t recommend doing it painlessly, as young people think it can be tolerated. The 3000 capsule mentioned above is a capsule endoscope, which takes a look at the entire digestive tract system, including the stomach, large and small intestines.