I had lower back pain for Years until I saw a podiatrist.
He ordered custom orthotics ( they were $ 585 at that time) and after getting them ,I wore them much longer then the podiatrist recommended the first day with them, (he said 'just use them for an hour' ) because my daughter was home on leave and I prepared her favorite food and we stayed up late.
When I went to bed that night I realized I had not followed his instructions but I woke up , and for the first time in years, without a backache !!!!
if I lift something heavy and don't use a back brace, I often get a minor backache that usually diminishes fast with a few Bone Builder exercises or some Ben gay.
Our feet take quite a beating and are often the reason we can have aches and pains.
That podiatrist retired and the new one I see gets orthotics made for only $350.00.
I say 'only', but then again foot problems can cause seniors to lose their balance and fall and that can cause further disabilities we don't need.
Yet Medicare does not pay for custom orthotics and that does not make sense to me.
I also buy all my shoes from Ortho feet. They are expensive but they are made for those who need orthotics in their shoes.
This may not be your problem at all, and I sympathize with anyone who has chronic back aches.