After having an upper gastrointestinal imaging, you can drink a moderate amount of water after 2 to 3 hours in the absence of bleeding, pain and other symptoms. Upper gastrointestinal imaging is a commonly used test for digestive tract diseases. It is a gastrointestinal imaging of the portion of the duodenum above the suspensory ligament of the duodenum, and the examination site includes the oropharynx, esophagus, stomach and duodenum. Before the examination, it is necessary to swallow the contrast agent (e.g. barium sulfate, etc.), add gum arabic to make a barium-gum paste, and sometimes add foaming agent for double contrast, which can more clearly show the tiny lesions in the gastrointestinal tract. Patients with gastrointestinal hemorrhage within 1 week should not undergo upper gastrointestinal imaging because the upper abdomen needs to be squeezed with a compressor during the examination, which can lead to recurrence of bleeding in ulcer or tumor bleeders; patients with upper gastrointestinal perforation can aggravate the symptoms of peritonitis after taking the contrast agent, so patients with digestive perforation are forbidden to undergo upper gastrointestinal imaging operation. After the upper gastrointestinal tract imaging patients, should follow the doctor’s instructions, can be about 2 ~ 3 hours after the end of the examination to drink water. If you find severe abdominal pain, vomiting blood and other symptoms, you should immediately consult a doctor for targeted treatment.