I suppose my back pain could be described as chronic - but it can vary in where it actually hurts. The main problem is in the base of my spine - spondylolithic spondylolisthesis (apparently), thickening and schlerosis of the facet joints, and a diseased disc. I start to hurt if i'm on my feet for more than a few minutes, but most of the time I can manage by sitting down for a while. When it goes (bad), it's as though the disc has popped out of place and is directly hitting nerves, so the slightest movement is agonising. I used to get a lot of "referred" pain in my right thigh, but while I still get it occasionally, it's not that frequent now. I still have trouble driving for more than 30 minutes at a time when otherwise "mobile", as it can hurt to lift my right leg to accelerate or brake.
To complicate things, that's not the end of the story
I have a similar problem right at the bottom of my shoulder blades - it was present when I first saw a "specialist" with my lower back, but they refused to look at it at all (!) - I get a lot of aching generally there (it's "nagging" now), and get a similar pain to the "disc out of place" as above at times. My movement with either of these (middle or lower back) rates at least 9.5/10 on the "can't bear this" scale, and it has been known to last for several months (you can imagine how depressing that got)
Last but not least, my car was hit by a truck in 2001 and I suffered whiplash so badly that I literally couldn't get dressed for over two weeks - i've had ongoing neck pain since (varying in intensity) as well as having digits on either hand going completely numb for a few days at times.
Medication wise, I take 30mg dihydrocodeine as sparingly as possible (I can cope with the pain most of the time now, but I reach a point where i'd need to take several at once to counteract the pain). Previously i've taken 6 within about 6 hours on a bad day while in work (I was scared to take any more because I was as high as a kite by then and had to drive home via a motorway). In retrospect, I should not have been in work due to the risk to myself and others due to the medication, but was subject to workplace bullying by my supervisor at the time. "Aspie" communication issues meant I couldn't relay how bad I was, and I was threatened with disciplinary action for being off sick.
Butrans patches (often given to cancer patients) - i've had two strengths - 5ug and 10ug (these stay on for a week). The 5ug don't do anything for me unfortunately, but the 10ug is pretty good - it was the only time i'd got genuine relief from a painkiler. Sadly, it also renders my responses too slow to be able to drive to work safely.