text: Common causes for abdominal bloating are:\n\nOvereating (gastric distension) \nLactose intolerance, fructose intolerance and other food intolerances \nFood allergy \nAerophagia (air swallowing, a nervous habit) \nAlvarez' syndrome, hysterical or neurotic abdominal bloating without excess of gas in the digestive tract \nIrritable bowel syndrome \nPartial bowel obstruction \nGastric dumping syndrome or rapid gastric emptying \nThe ingestion of some gas-producing foods \nConstipation \nSplenic-flexure syndrome \nMenstruation, dysmenorrhea and premenstrual stress syndrome \nPolycystic ovary syndrome and ovarian cysts \nMassive infestation with intestinal parasites, such as worms (e.g, Ascaris lumbricoides) \nDiverticulosis \nImportant but uncommon causes of abdominal bloating include large intra-abdominal tumors, such as those arising from ovarian, liver, uterus and stomach cancer; and megacolon, an abnormal dilation of the colon, due to some diseases, such as Chagas disease, a parasitic infection.\n\nGaseous bloating may be a consequence of cardiopulmonary resuscitation procedures, due to the artificial mouth-to-mouth insuflation of air.\n\nPostmortem bloating occurs in cadavers, due to the formation of gases by bacterial action and putrefaction of the internal tissues of the abdomen and the inside of the intestines.\n\nIn some animals, like cats, dogs and cattle, gastric dilatation-volvulus, or bloat also occurs when gas is trapped inside the stomach and a gastric torsion or volvulus prevents it from escaping.