It is possible for duodenal bulbitis to cause constipation. The cause of duodenal bulbitis may be related to Helicobacter pylori bacteria, or it may be related to eating irritating, spicy foods, or using specific medications. Its typical clinical symptoms are abdominal pain in the upper abdomen and pain at night, and common symptoms include nausea, vomiting, acid reflux and heartburn. When duodenal colitis attacks, there will be epigastric pain thus affecting the appetite, resulting in a reduction in the amount of meals intestinal food will also be relatively reduced, gastrointestinal peristalsis is weakened, the water and inorganic salts inside the stools are reabsorbed, and there will be a dry stool, which will lead to constipation. If there are symptoms of duodenitis or constipation, it is recommended to go to the hospital as soon as possible, under the guidance of the doctor to give appropriate measures.