Symptoms and manifestations of duodenitis mainly include abdominal pain, dyspepsia and gastrointestinal bleeding. 1. Abdominal pain: most patients will experience varying degrees of epigastric pain, which may also be manifested as subxiphoid pain. The pain tends to recur, and it is often more pronounced during fasting, and the symptoms will be relieved after eating. 2. Dyspepsia: patients often have symptoms such as decreased appetite, fullness and acid reflux in the epigastrium, nausea, vomiting and heartburn. 3. Gastrointestinal bleeding: patients usually have black stools, which may lead to vomiting of blood in severe cases. There may also be some other symptoms, such as anemia, emaciation, etc. If these symptoms occur, you should consult a doctor for examination in time.