The severity of duodenal bulb ulcers varies, as does the duration of obstruction, depending on your situation. Duodenal bulb ulcers are caused by excessive gastric acid secretion and Helicobacter pylori infection, and common complications include bleeding, perforation, and pyloric obstruction. In the early stage, if the ulcer is severe enough to cause inflammatory narrowing, edema, and thickening of the duodenal bulb, there will be pyloric deformation and obstruction of the passage of food; pyloric obstruction may also occur after the ulcer heals because of fibrous scar proliferation. Obstruction is indicated if the patient experiences discomfort with eating, abdominal distension and severe vomiting of overnight lodging food, but not bile. There is no specific time as to how long it will take to cause obstruction, which is also based on the patient’s own condition. If the obstruction is caused by an ulcer in the duodenal bulb, the patient should seek medical attention to identify the cause and treat the symptoms.