To have a painless colonoscopy, you can choose to have a painless colonoscopy. However, before having a painless colonoscopy, you need to do pre-anesthesia preparation, such as having an electrocardiogram, cardiac ultrasound, and having venous blood drawn for cardiac function. The patient’s vital signs will also be evaluated to assist in whether there is a risk of anesthesia. The anesthesiologist will not allow the patient or the subject to undergo painless colonoscopy until after a detailed assessment that the anesthesia can be tolerated, which is, after all, anesthesia. Although the patient does not feel pain during the whole examination, there are certain risks of anesthesia after all, and there may be corresponding anesthetic side effects after the colonoscopy, such as dizziness, nausea, vomiting, etc. Therefore, it is recommended that the patient can try to choose to do a general colonoscopy.