> If I had to be in serious pain every day but could keep doing many things I would rather keep living with the pain.
Scratch that: ~~~No, you (most probably) wouldn't.~~~
EDIT: this post is about severe chronic pain. Think cancer, or a serious toothache which lasts for years. And it's not meant to discuss the specific situation of the parent! I'm talking in general. I also agree that not 100% patients with severe chronic pain will consider suicide, however the percentage of people considering suicide in such group is much higher than in the rest of the population.
You may believe so right now, but that's totally irrelevant: just as you were unable to imagine "how much pain it was possible to feel" before your experience, you are unable to imagine what a serious, chronic pain can do to you.
Chronic pain is a lot like depression: there's no relief, no hope, nothing you can do to ever feel any better. Assuming that you'd be able to do anything - and that doing that would even make you happy - is... well, very improbable, to say the least.
> Anyway the point is, not everyone is afraid of pain and suffering. Especially not to the point that suicide would even be considered.
Sure, it's easy to be brave in the face of the unknown. It's a lot harder to be brave once you see what "chronic pain" really means. And there is no notion of being brave (or not) once it actually happens to you - there's only despair and suffering. Really, only that. Nothing else, at all.
We have a lot of pain management methods at our disposal now and, in many cases, it's possible to reduce the symptoms and make the patient feel "well enough". Without such help, however, it's only a matter of time before (most of) the patient considers suicide - no matter how brave and "suffering accepting" he was before.