When certain things touch various small areas of my stomach, including sides,
solar plexus area, central lower,
and just around toward my back on the sides,
and the touch lasts for a period of time longer than a couple moments, it causes discomfort that begins small, and gradually grows until it causes severe stomach cramps, and can lead to diarrhea and/or vomiting.
I seem to have become used to certain things, for instance, wearing a t-shirt doesn't bother me all the time.