“…Because many nonsteroidal anti-inflammatory drugs are available over-the-counter, physicians tend to underestimate the use of these medications. Nonsteroidal anti-inflammatory drugs are a well-described cause of acute colitis, even in patients without IBD [77,78]. Nonsteroidal anti-inflammatory drugs have been associated with flares of both UC and CD in several case series and case-control studies [79][80][81][82][83][84].…”