I've been dealing with various back problems (aching, sensitivity, etc) since I started high school four years ago. Over the last month or so, I've been feeling extreme tightness in the middle of my back, and can only relieve it by twisting side-to-side and popping it. None of my joints have popped easily before this, and none others do now, but my back consistently pops every time I stretch. I have to do this once every half-hour or so, or else the pain becomes unbearable.
A doctor visit is kind of out of the question right now due to financial reasons.