I don't think anyone knows for sure or has been able to pinpoint a direct cause for IBS. There's a section on the main site about IBS; here's what I found:
Interestingly, the origins of IBS may really be in our brains, and not in our bowels. Given that for many years people with IBS were dismissively told their problem was "all in their heads", it's ironic that, in the end, this may be factually true. The underlying problem might well be in our brains - but it's absolutely not in our imaginations.
No one really yet knows exactly why some people develop IBS and others don't. There is mounting evidence that for some IBS sufferers the condition is precipitated by some type of grievous insult to the gut - dysentery, food poisoning, intestinal flu, abdominal surgery, even pregnancy. The theory goes that even after full physical recovery from these traumatic events, the nerves within the gut retain a "memory" of the insult and remain hyper-sensitive to further stimulation, as well as prone to subsequent over-reaction. You likely know if you experienced any abdominal trauma immediately prior to the onset of your IBS symptoms, and if you did it's probably nice to have a logical explanation for what has happened to your GI tract and why. There are those of us who are exceptions to this theory, however, who suffered no gut insult prior to the onset of IBS symptoms, and we're still patiently waiting for our explanation. - What is IBS, Symptoms, Diagnosis, etc.
Your use of antibiotics was probably enough of an "insult to the gut" to trgger your IBS.
HTH.
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Re: What causes IBS??
