I had a problem with my thumb called trigger thumb. A health situation where the finger locks and to unlock is very painful. Tried the hot heat treatment in addition to eating a lot of pineapples which is supposed to contain bromelain, a substance that is supposed to aid the cure. To no avail. By chance I discovered a painlesslump in my anal region. In a bid to get rid of the lump which I feared might be cancerous I started myself on a soursop tea treatment daily. To my greatest surprise not only did the lump disappear, the thumb trigger condition disappeared. I have a friend who suffers from rheumatoid athritis. I will tell her about this and see if it will alleviate her condition.
EC: For those interested in learning more about soursop, see: http://en.wikipedia.org/wiki/Soursop