Sometimes it may have psychological roots, but many times it has physical roots that are not obvious. Docs are pretty good at diagnosing the cause of pain when you are bleeding profusely or a bone is sticking out at an angle or in more pieces than designed. My mom suffered chronic pain for decades and all the docs treated with a combination of drugs that either killed the pain or targeted "psychological". It took 40 years to find a doc that wanted to actually look for a physical cause, which was eventually found. Unfortunately 4 decades of drugs prescribed to not treat the underlying problem destroyed her liver which ultimately was fatal.

The phrase "do no harm" has been mostly forgotten in medicine today.