I live in india. i have ulcerative colitis but also have inflammation in duodenum(d2). what could be the cause for this inflammatio??

Could be Crohn's: Lots of things cause duodenitis, most commonly H. pylori infection or medications such as ibuprofen. Something else to consider is that your ulcerative colitis might actually be Crohn's disease. This mistake is frequently made in the diagnosis of inflammatory bowel disease. Some people even undergo colectomy only to have recurrent symptoms in the small intestine more typical of Crohn's disease.