I have life-long scoliosis, which various doctors have described as being from “moderately severe” to “severe”. When I was a young-un, one doctor or another prescribed exercises to strengthen the spinae erector muscles (all those muscles in the back that hold the spine up), which I mostly didn’t do.
Now I have chronic low-back pain that I would describe as moderate or maybe a little worse than moderate. I chow down ibuprofen like they are M&M’s. MRI’s have shown stenosis, which I think means the openings through which nerves emerge are getting crunched. One doctor, about 10 years ago, opined that it would gradually keep getting worse as I get older. So far, I think he’s been right.
I asked a doctor about 30 years ago what causes this. His guess was childhood sub-clinical polio. Note that I was born several years before polio vaccine was invented (and I remember the massive public innoculation campaigns they had when it first came out). In those days, polio was a great terror. (There was a thread about that recently, with links to photos of whole rooms full of people living their lives in iron lungs. And those were the lucky ones who survived, if you call that lucky.)
It was extremely common for very young children to get polio. If you get it before a certain age (like, before you’re 6 weeks old or so), it causes little or no permanent damage, and was commonly mistaken for a cold. AND you got immunity against re-infection later at an older age, when it really did the worst damage. My doctor’s speculation was that I had probably gotten polio as an infant, which was sub-clinical (meaning so mild that it was never recognized). It may have left me a little bit weak in some of my muscles, possibly just on one side. If the erector spinae muscles are weaker on one side, the stronger muscles on the other side will contort the spine into an asymmetric conformation. And that’s what scoliosis is.
All my life, I’ve noticed that I slightly favor my left side, even though I’m right-handed. For example, when I carry things (like carrying books to school), I always carried them in my left hand. And that’s the direction my spine is bent too. So my doctor’s theory seems plausible.
ETA: P.S.: And BTW, back in the early 1970’s, this got me classified 4-F.