The location of pain in duodenitis is usually in the upper abdomen. When there is pain in the upper abdomen, especially the right upper abdomen, accompanied by symptoms such as fullness, acid reflux, belching, nausea, hunger pains, nighttime pains, upper gastrointestinal bleeding, etc., and physical examination reveals mild pressure pain in the upper abdomen, the possibility of duodenitis needs to be considered and promptly treated by a doctor.