Buddhism

(never had them, but understand they are very painful).
For extreme pain, the thing to do would be to have it tended to.

I don't have chronic pain either, but according to what my teacher says, one would make the pain the object of meditation.

So, instead of focusing on the breath, one would focus on the pain. Without judgement.
And with curiosity. So one would notice where the pain is, does it move, is it hot or cold, does it vary in intensity, duration, and so on.

rhscaps.rutgers.edu/self-help/mindfulness-meditation/short-mindfulness-meditation-practices/
At this site, there are some sample meditations by my teacher, who studies with jon Kabat Zinn- it includes a pain meditation.