Is the pain radiating to front part of abdomen?
Since how many days you have pain ?
Any past medical issue?
Numbness in thigh? Age and sex?
The Lower right back pain traditionally is central and comes from the spine.
Usually pain comes from the Sacro-iliac joint. This is the joint out from the spine and links your spine to your pelvis.
This can be managed with prescription medications and physical therapy.
Also it is important that you should go for X-ray/ MRI of spine.
Other possibilities are- herniated disc, Arthritis of spine.
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Well, ideally you should have a ultrasound , to diagnose the cause. There is possibility of kidney stone. A detailed clinical checkup is required from doctor .
please get it checked.