I hear quite a few people who talk about family members with similar symptoms.Im just interested as I have IBS c and have had it bad for 6 years.I have had the barium enema, colonoscopy and endoscopy.I have seen many doctors and they freely admit they dont know what the cause is.I maintain an open mind about the causes of IBS. I think i have taken the investigative side of things as far as i can now. I have not ruled out the possibility that it is contagious. If it is bacterial it may well be. Although unlikely.Anyway. please tell me if any of your family has similar symptoms. Thanks.