Can you have dumping syndrome without surgery?

No. : Dumping syndrome is comprised of symptoms such as bloating, pain, diarrhea, nausea/vomiting, lightheadedness, etc. That occur after gastric (stomach) surgery. Such procedures for ulcers, cancer, and nowadays more commonly bariatric procedures like roux en y gastric bypass are known to produce dumping syndrome. This is due to the pyloric valve of the stomach being bypassed or removed.