There are alot of reasons for Back pain like Injury , lifting heavy weight , mechanical , Arthritis,osteoporosis ,etc firstly rule out the cause.
For that you might need to get a physical examination done by your nearest orthopaedic surgeon.
Also precise clinical history is helpful to get an idea about the back pain, like :
1. When it started ?
2. Radiation of pain or numbness to either leg?
3. Pain in flexion or in extension ??
4. If pain subsides after walking or moving around?
5. Do u have knee or ankle pain alongwith back pain?
To get a cleared picture consider online consultation or to your nearest orthopaedic surgeon.
Next Steps
Get examined
Health Tips
Do not self medicate.