Long-term bloating but without pain may be due to intestinal flora disorders, abnormal gastrointestinal motility, constipation and other reasons. 1. Intestinal flora disorders: the homeostasis of intestinal flora is disrupted, which may lead to changes in intestinal sensory-motor function, and at the same time, the flora through the sugar fermentation gas production may lead to abdominal bloating, but without pain. 2. Abnormal gastrointestinal peristalsis: gastric or intestinal peristalsis dysfunction, such as irritable bowel syndrome, functional constipation patients, due to the decline in the function of gas transportation, removal, may lead to long-term abdominal distension, but painless. 3. Constipation: Long-term bloating is not necessarily caused by gas retention, but may also be caused by constipation and retention of fecal matter in the intestines. If you have chronic bloating, it is recommended that you go to the hospital in a timely manner to avoid delays in treatment under the guidance of your doctor.