Stage A1 of duodenal bulb ulcer usually means that the ulcer is in the active stage, generally speaking, the ulcer is relatively mild and limited to the mucosa and mucosal layer, because in the staging of duodenal bulb ulcer by gastroscopy, it is usually divided into stage A, which is the active stage, and stage H, which is the healing stage, and stage S, which is the scar stage. stage A causes the ulcer to be limited to the mucosa and submucosal layer, and for stage A1 of duodenal bulb ulcer It is usually necessary to avoid spicy and irritating food, strong tea, and alcohol, as well as regular anti-ulcer treatment, usually with triple or quadruple drug therapy, which requires two courses of treatment, each course usually takes about two weeks. After the two courses of anti-ulcer treatment, gastroscopy will be repeated to observe the recovery of duodenal bulb ulcer.