Follow the red arrow, but probably a little higher up than that just below the bust (chest) really. By "back", I meant the pain can travel from front-side right into into the back itself and in same position.
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I know 1-2 hours before the pain starts, because at first you feel uncomfortable in that side area, that's the only way I can describe it really, feels a little bloated there. I just know, mainly because I'm used to it now and can tell right away if the onset of it is starting before the pain kicks in later. I should stress this is not something I get on a weekly bases or anything like that, can go months without it happening now mainly because I'm more careful. But then out the blue it just does it after eating something and tried to pinpoint what it is. But it can happen with some meals, then eating the same meal again later it doesn't happen.
But over time I've been able to draw up a list of what seem like high risk foods prone to kicking it off, which I mentioned above in my previous post. Eggs, I avoid boiled or fried eggs (full stop). But I love them, I will still eat scrambled, but very rarely do I eat eggs at all now and will avoid them. Fried food, as in frying something with cooking fat. I think it's the fat itself so avoid it. I sound like a walking disaster area, but it's not as bad like it sounds and happens rarely to me. If anything I eat more healthy now!