red flags for lower back pain, are change of sensation, or numbness in the perineum, incontinence (uriinary or faecal), weakness, or lack of sensation in the legs..
If all those are fine you could probably sweat it out, although Dr can provide some better pain relief. An anti-inflammatory like diclofenac can be real helpful.. Even better if injected in yer ass.
Chronic lower back pain is actually surprisingly uncommon, in a lot of countries where sickness benefits were paid for lower back pain, once the benefit was cut, the number of presentations to Dr's fell towards 0.
Nonetheless a Dr is always good for some piece of mind.
