As I've had back and neck surgery I assumed the the pain was due to that. Pain, stiffness, sore muscles, sciatica always worse on the right but since starting B12 jabs, a lot of the pain has gone. The sciatica, which was probably the worst, always on the right (buttock and usually down front of leg to the knee, sometimes the back of), is rare now as is a lot of the lower back pain. I used to get really bad lower back pain when I needed to empty my bladder - now gone since jabs. The pain I do still have is mostly in or around my right shoulder and not quite so much, neck, which gets worse when I am low. I also used to get a very numb right foot/leg, especially when driving but this is noticeably reduced now too.