Duodenal bulb ulcer S1 stage is not serious, S1 stage means the bulb ulcer is currently in the scarring stage, if it is S2 stage, it is more stable, but as long as the patient is currently reviewing the electronic gastroscopy clearly the ulcer is in S stage, it means the ulcer lesion has basically healed and has formed a scar, so it is not considered a serious disease. In addition, bulb ulcers are also divided into stage A and stage H. Stage A refers to the active stage and stage H refers to the healing stage, and relatively speaking, stage S is the least severe, while stage A is the most severe. However, duodenal bulb ulcers, including gastric ulcers, are benign and curable diseases, so they are not considered serious diseases, so please rest assured.