Flatulence the day after a back sprain may be caused by eating foods that produce gas easily or by damage to the autonomic nerves that govern gastrointestinal motility. It may be caused by eating too many potatoes, onions and other easily flatulent foods after the back sprain, producing too much gas and bloating. It may also be caused by lumbar sprain lumbar vertebrae fracture or dislocation, damage to the lumbar autonomic nerves, the autonomic nerves governing the gastrointestinal peristalsis function abnormally, the gastrointestinal peristalsis is slowed down, the food can not be digested and absorbed in a timely manner, in the body produces gas will appear bloating. There may also be some digestive diseases, such as acute gastric retention, usually use gastrointestinal decompression to suction out gastric contents, if the pyloric edema caused by obstruction can use some acid-suppressing drugs such as omeprazole, and at the same time to be lubricated with warm saline gastric lavage to promote the absorption of edema. If the obstruction is caused by fibrous scarring, surgery is needed. After the back sprain stomach bloating, excluding eating and other physiological reasons, may also be other reasons, should promptly consult a doctor, under the guidance of the doctor for treatment, so as not to delay the condition.