Yes, I have it too. I believe that the lower and upper spine are primary places for the mercury to take its effect. I believe that it is stored there. It makes sense to me that its proximity to the intestines is important. One of my pre symptoms to my amalgam removal was weakness in the lower spine and pain. Now whenever I have more intense detoxes I get weakness or numbness and cracking in that area. Also, I have continuous tightness in the neck. This was a post amalgam symptom