What percent of cases of back pain might be due to viral irritation of connective tissue involved with movement for bending and rotating the torso? Is there a viral cause in other types of painful musculoskeletal conditions?

Here again, we would say that approximately 60% of all such musculoskeletal complaints, wherever they arise in the body, can be considered an aggregate of conditions becoming symptomatic because of viral presence. As you can see, there is a perfect opportunity for interplay with the Law of Karma in bringing around prior negativity, and it might well be that additional past karmic negativity becomes the straw breaking the camel's back, in a quite similar fashion to this metaphor, leaving a person in chronic pain with restricted movement that can become quite debilitating and life-limiting at extremes. This nicely explains why, in the face of karma being The Great Leveler, there are so many somatic complaints involving areas of the body involving physical exertion. We did not design humans to be incapable of going the distance and functioning lifelong, at least with reasonable rest periods and foundational support through nutrition. The seeming frailty, especially with advancing years, is quite often due to a concomitant viral attack on the tissues, and this causes the body to cry out in pain from even mild stress and slight movement in many cases. It also explains why such things frequently remain mysterious and poorly defined or understood by medical science.