Bloated stomach with blood in stool may be related to constipation, malignant tumors, intestinal infections and other reasons. 1. Constipation: when constipation when the feces accumulates in the intestinal tract, due to increased pressure in the intestinal tube can cause the stomach to swell and bulge, defecate with excessive effort caused by the anal canal skin and mucous membranes to be propped up and cracked, resulting in blood in the stool. 2. Malignant tumor: malignant tumor cells invade the intestinal tissues, and the erosion of intestinal tissues can exude blood, which is manifested as blood or pus in stool, and the tumor may also lead to the dysfunction of the colon, and the decrease of peristaltic ability of intestinal lumen, which leads to the accumulation of excessive gas in the colon, and causes the bloating of the stomach. 3. Intestinal infections: such as chronic bacillary dysentery, the intestinal mucosa can be damaged to exude blood, causing blood in stool. Can also cause intestinal flora imbalance, produce too much gas caused by the stomach bulging. Bloated stomach with blood in the stool may also be due to other causes, such as chronic colitis. So you should go to the regular hospital in time, improve the examination, clarify the cause of the disease, under the guidance of the doctor for standardized treatment.