A bit of bloating 5 days after gastrectomy may be caused by the following reasons, such as gastrointestinal anastomosis obstruction, intestinal obstruction, dyspepsia and so on. 1. Gastrointestinal anastomosis obstruction: If there is obstruction of gastrointestinal anastomosis, it will cause bloating, etc., which can be diagnosed through gastrointestinal imaging. 2. Intestinal obstruction: Intestinal obstruction can also lead to abdominal distension, which can be clarified by standing abdominal plain film examination. 3. Dyspepsia: If there is bloating after gastrectomy, it may be caused by dyspepsia, so it is recommended to adjust the diet structure and insist on eating less and more meals. After gastrectomy, it is recommended to go to the hospital regularly for review, if there is any discomfort, it can be diagnosed in a timely manner and treated to avoid deterioration of the condition.