Patients who are too hungry to stand before having a colonoscopy can relieve their hunger by replenishing glucose through intravenous infusion. When doing colonoscopy, patients are generally required to be in a fasting state, and cannot eat on the same day. If the patient is too hungry to bear, glucose can be fed into the body by means of infusion, so as to replenish the patient’s energy and reduce the feeling of hunger, and then wait until the body recovers to do the colonoscopy again. Patients doing colonoscopy mainly eat fluid or semi-fluid food, such as porridge, pasta, etc., on the day of the examination, patients must not eat before the examination, so as to avoid the accumulation of food in the intestines and stomach, which will cause interference to the examination. Patients should report to the doctor if they feel unwell before or during the examination, and should not consume drugs or food privately to avoid affecting the examination and treatment results.