66 years old... at 25 I injured my back as a diesel mechanic.. the doctors said surgery... I went to a chiropractor and he popped me back into place and showed me some stretching exercises. I was fixed for over ten years until I had a car accident. Doctors said crushed vertebrae in my neck. Chiropractor looked at the x=ray and showed me the misalignment. cracked my next and i was fixed. I have walked in over the years with a migraine headache had them crack my neck and the migraine disappeared with n seconds and gone in minutes. If you hit a pothole your car needs alignment, so does your body. Watch videos. Fora tight back and spasmed muscles it is the right thing to do and natural... or touy could see if Pfyzer has a solution for your ache.