Recently had col/endoscopy. biopsy results say med induced inflammation. parasites and infection ruled out. i take no meds what else could cause this?

Depends.: It depends where the inflammation is, your general health, and why you had these procedure(s). If the inflammation is in your colon, you might have to think of colitis/inflammatory bowel disease. In the stomach, it could be the start of an ulcer, and in the esophagus, it can be anything from reflux to stress to scleroderma. If you're healthy, it can be ok but talk to your dr.Or give more info.