As a high school student, I study for a long time in the third grade, and I often have backache. Sedentary, getting up in the morning will hurt your back.
I went to see a doctor after the mid-term exam, and I said yes, but I sat for too long.
Sit upright, straight, and do not lean to one side;
Try not to sit down if you can stand;
Exercising back muscles, such as swimming, is a good way to exercise and relax, and will not burden the vertebrae;
Swimming is indeed a particularly common sport.
If you are sedentary, try to get up and stretch in the middle and bend in all directions;
Have a good rest and activities on weekends and holidays, and avoid lying on the table for a long time.
That's what I did, and now there is no problem of low back pain.
I think your back problem may be more serious. Really, go to the hospital sometime. If it is a lumbar problem, it is relatively easy to correct it now. Take care of yourself!