Kind of like being short, or not as smart as the next guy. It's just the way it is. No point worrying about it.
However, if you viewed it as a serious problem and when is it going to be fixed and then... never... yeah, that would be very different.
Even with chronic pain, it's probably not the end of the world when it's "an ache in my knee when I move in this direction" or even "a mild ache in my knee always". But if it's "at random, frequent times, my back hurts too badly to stand or function", that's super hard to ignore or get used to, and I can see being incredibly upset by it. Cluster headaches come to mind as following this sporadic + devastating pattern, and indeed they do cause a fair bit of suicide.
"Can't escape it" and "can't get used to it" are an ugly combination.
Pain and grief, even when they are absolutely horrible, don't appear to be strongly correlated with suicide. Inescapable problems, even when they are not so severe, absolutely do.
Broadly, people seem to turn to suicide either when their circumstances seem unimprovable (chronic pain, inescapable debt, irreparable loss) or when they lose the ability to imagine recovery (acute depression, various forms of psychosis). I think that when considering suicide, experiences like "I've been in that much pain" are basically irrelevant - the operant part is the permanence, not the severity.