It is possible for duodenal bulimia to cause constipation, which may also occur due to the presence of other diseases such as diabetes, intestinal masses, and Crohn’s disease. The main reason why duodenal bulbitis causes constipation is because it affects the diet. Duodenal bulb can cause symptoms such as acid reflux, bloating and stomach pain, and the patient’s dietary habits change as a result of the uncomfortable symptoms, such as a decrease in the amount of food eaten and a decrease in the amount of vegetables and fruits consumed. The combination of other diseases may also lead to constipation. For example, diabetes mellitus patients will have different degrees of abnormal gastrointestinal peristalsis, increasing the probability of constipation; intestinal tumors can also have fatigue, blood in the stools, changes in bowel habits, emaciation and other symptoms; irritable bowel syndrome can also have diarrhea and constipation alternately, abdominal pain, abdominal distension and other conditions. For duodenal bulbar inflammation with constipation, it is recommended that the condition be analyzed by a doctor.