Hi, I am new to the site and have found a lot of useful information, however, I haven't been able to find anything relating to my question. This is where I hope you guys will help. I am 26 years old and recently ( 9 months ago ) had a daughter. In August I started having severe diarrhea. I finally had enough and went to a GI. He told me that IBS doesn't just " come on " all of a sudden and recommended a colonoscopy, which I am having done on Thursday. I am puzzled by my symptoms because I have always had an iron stomach. Finally my question, have any of you had IBS suddenly appear after years of having no problems? My symptoms are, diarrhea, cramps, abdominal pain/burning, chronic fatigue, loss of appetite, gurgling in left side, etc. I would love to hear any ideas or suggestions. Thank you.