Could be due to stress/trauma.
I actually discovered it by chance. In 2017 I twisted my wrist doing some dumb stuff. My mom had Shilajit at home and suggested me to have it (Shilajit is sold as a SAX TAANIC but it has a lot of other benefits!) So I had it as mom knows best hehe. The pain .. to my surprise decreased rapidly .. i 11 days it was 99% gone, 12th day I was on my bullet off to work without much pain. This got me very curious and I started digging. Since then I have been on/off on Ayurveda specially during winters I have them. Tremendous side affects 
