https://www.nytimes.com/2025/01/12/magazine/chronic-pain.html?unlocked_article_code=1.ok4.R36E.qUv9z1Er0wUf&smid=url-share

I think helpful. Mentions CB-1 cannabinoid. Mixes idiopathic (her disorder) and secondary (OA, spine).

Most chronic pain is thought to be in the head, specifically in the brain where all pain lives. A kind of cortical malfunction.