Painless colonoscopy and gastroscopy can usually be done together, and patients should go to a regular hospital for the examination. Both painless colonoscopy and gastroscopy can be performed in one anesthesia. Painless colonoscopy is less harmful to the patient, reduces the feeling of pain, and is usually performed by entering the intestine from the anus to examine the intestinal tissues. Gastroscopy uses a tube to enter the stomach through the mouth or nose to examine the gastric mucosa, esophagus, duodenum, and other parts of the stomach. The day before the painless colonoscopy and gastroscopy, you should refrain from smoking, eating after dinner, and not drinking water on the day of the examination. In the 24 hours after the examination should be prohibited from eating spicy food, mainly liquid food. Patients should keep a relaxed mood during the painless colonoscopy and gastroscopy, and when discomfort occurs after the examination, they should consult a doctor in time to avoid adverse consequences.