If you are too hungry the night before the colonoscopy, you should consult the doctor in charge, and with the doctor’s consent, you can take in a small amount of light and easy-to-digest food, but you need to ensure that you fast for eight hours before the colonoscopy. After the colonoscopy is through the anus, the colonoscope will be inserted into the cecum area, from the mucous membrane side to observe the colon lesions of a kind of examination method. When the patient before the examination, need to take preparatory measures. In the three days before the examination, need to eat a light diet, avoid eating greasy, spicy stimulating food, avoid eating high fiber food the day before the examination, eight hours before the examination need to fasting. If the colonoscopy patients, in the night before the examination is too hungry, you can appropriate intake of light and easy to digest food, should not be too much, so as not to affect the results of the examination. At the same time, you need to take oral medication to clean the intestinal tract, and after taking the medication, you need to drink more water to promote intestinal emptying. Colonoscopy can detect the presence of colon polyps, intestinal obstruction, abdominal masses and other conditions. If a patient experiences persistent abdominal pain, more bleeding in the stool, or an elevated body temperature after colonoscopy, he or she needs to report to the doctor promptly.