Is Ibs common in young adults?

Oh my, yes! Irritable bowel syndrome (ibs) is a condition associated w/ abdominal discomfort, altered stool pattern, & among others accompanying nausea, bloating, gassiness. Often improved by stooling, ibs is defined by changes in perception of gut distension, motility, sensation. Diet & emotional stress play significant roles here in such patients. Need to rule out first inflammation, ischemia, & infection.
IBS. Yes, it is pretty common in young adults. You should know that it is just a diagnosis (a label essentially), and in my experience, lifestyle changes will often completely eliminate it in many people. Best wishes to you.