Think of this as an over-reaction of your body trying to heal.
The surgeon opened a hole in your stomach to connect your bypass, so the body is very naturally going to try to close the opening, as it isn't "natural" for an opening to be there. Most times, since the intestine itself is a hollow tube, the fact that the opening is stapled to something that won't try to close, is enough to keep it open, but on occasions, when the inflammation is strong, or you have a stronger tendency than average to heal, strictures can happen. Eventually, the tissue on the pouch's side of the opening (stoma) will "solidify" and once it's settled, strictures shouldn't happen, unless you get ulcers in the vicinity of your stoma, in which case, strictures can be caused as a result of the body trying to heal the ulcers.
It doesn't happen because of something you did, so you don't have to worry about doing something wrong to cause it, so long as you don't stimulate your pouch a lot very early out, when the healing process is still very active.
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