What can cause left side of the bady pain ? From the top of the head to the two outside toes on right side. I've had this for about 12 years. It started in my right arm, then up the right side of my head, then eventually down the right side of my spine right down to toes. About every six months or so I will get a really good day with very little to no pain and the pain will shift to the left. Everything that was in pain on the right side, shifts to the left and the right side will have no pain for a couple of days. Then shift back to the right, during this time on a scale of one to ten the pain is a 10. Got checked for MS, and a brain tumor, but tank god don't have either. Would love to have a answer for this. Should mention that I had a c-section 12 years ago