Someone was told by a Chinese doctor that they had arthritis. The person was confused, claiming their joints always felt fine, so the doctor explained the following:
Arthritis is poison (toxins, ama) in the body. It starts in the soft tissues… skin, muscle, etc. Over time, it goes deeper and deeper until it gets into the bone. Clearing toxins clears arthritis. Of course, when too advanced, it will not likely be reversed.
Totally makes sense to me, went even deeper in my case to the nervous system. Fortunately I encountered the Surya Ram meditation; it lifts a lot of the daily waste products out for me.