What are the symptoms of duodenal ulcer?

Duodenal ulcer mainly causes upper middle abdominal pain. It is caused by excessive acid secretion to stimulate the duodenal ulcer surface. The main feature of this abdominal pain is hunger pain, that is, three or four hours after eating pain symptoms, especially can be manifested as midnight pain wake up. Generally upper middle abdominal pain can be relieved after eating. Pain symptoms and periodic, regular, repeated attacks.