Why do I always have an upset stomach after eating?

This has been happening since I was 16, maybe even younger. I try my best to avoid eating breakfast in the morning (pancakes, waffles, sausages, eggs, grits, etc) because right after I am finished eating breakfast, my stomach becomes upset and I will have to poop afterwards. I didn't really think much of it until now. I've known about this, yet it was so hard trying to get rid of the source. I believe I have a bad digestive system. I think the source to this is spicy things that I like to eat. I am trying my best to cut down on the spicy things I eat, because sometimes, it'll give me bad acid reflux as well.

Why do I always have an upset stomach after eating?
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