Peripheral neuropathies as in diabetes, hypothyroidism, Lyme's and lupus are the other possibilities. It can also be spinal nerve
compression in lower back.
Other than this, yes, a nerve block
or radio-ablation helps relieve pain. However, it may cause numbness in the area that was earlier painful. So, it is first important to rule out all the above mentioned causes of pain. You could also try physiotherapy, traction, spinal cord stimulator, opioid pain killers, TENS therapy etc.