Unfortunately, I qualify to post here!
About 2 years ago we had a dog that was suffering from seizures who ended up losing her ability to walk on her own, and then the ability to stand on her own (meanwhile under diagnostic testing and treatment/medication). Sadly, we ended up having to put her to sleep. During the time she could not walk on her own, I had to carry her outside/inside to go potty on a regular basis.... as well as in/out of the car to go to the vet/emergency room, then to/from the car when we got to the vet/emergency room.
I weigh/weighed approx. 105 pounds and am currently 20 yrs old. The dog weighed 50 pounds (mostly "dead"--no pun intended-- weight, since she could not get around on her own). Needless to say, the lifting and carrying on a regular basis did me in and while I was crouched over to do something non-related, I heard a noise and it was my back!
It hurt a lot for a few days to the point of even hurting without movement, no way to relieve it, etc., then the pain kind of wore off. I think it was a few months (or maybe sooner, I don't remember) later I started to have issues with my sciatic nerve down my left leg. I dealt with it for a few months. Then, my lower back started to hurt a lot on/off, and I lived with that for about a month or so. The last straw was when it started to affect my riding, in that the leg sometimes became slightly numb, I was not able to "control" the leg and keep it still as well as the other, it was still painful, etc. At one point, I was riding and it felt like a metal steak drove into my lower back.
After that, I started seeing a chiropractor every week for a few months. My L4 was misaligned, as well as a disc in my neck (I have had very frequent migraines for YEARS... and now know why), and my hips were a tiny bit uneven with eachother. Insurance stopped paying for the adjustments, and I almost stopped going because it was like I hit a peak where the treatment was almost 100% successful, then it started going downhill again. I stuck with it and they started doing a massage prior to the adjustment which helped a lot at first. Now I am down to once every other week and am still dealing with some pain. The lower back pain is MORE of an issue than the sciatic pain down my leg (which also went into my right leg during the first months of treatment). When the sciatic pain was at its worse, if I was sitting I would not be able to stand and stretch all the way up to be able to walk "normally", but would have to limp a little. Now, if I sit for long periods of time, or stand still for around 15-30 minutes or longer, my lower back will start to hurt, then the sciatic nerve will kick in on my left leg. There is no way to immediately get rid of the pain, but sitting down (painful at first) helps, and after an hour or so the pain diminishes. Thankfully, I haven't had any recent problems with riding as a trigger for my pain, it is most often just standing and talking to somebody (I am usually okay if I am on my feet walking around doing things) that triggers it.
I was initially told by my chiropractor to stop sleeping on my stomach, which has helped with my migraines, but I still get them a few times a week (though it is much less often than before and much less severe). Also, I sometimes wake up with lower back pain, but not very often.
So, in short, riding did nothing to cause my issues, but deep down inside I always worry that a bad fall could make the pain worse. It is more so the barn chores and things around the house that do me in (dragging things, lifting semi-heavy things, picking my horse's hind feet when he insists to let me hold all the weight of his leg, etc.).
As a side note, I also received 3 sessions of TENS (transcutaneous electrical nerve stimulation) a while back, but none recently. We bought one of our own to use at home, but have yet to do so. I personally didn't really feel a difference when I had it done.