This is Dr Basu, experienced Internal Medicine Specialist.
I am here to address your concerns and provide great service.
If you do not have any urinary symptoms then this is not likely kidney related problem.
Still given the location, urinalysis is recommended to rule out any bacterial infection.
The likely cause, however, is due to the sensory nerve related problem.
The nerves there are inflamed and not perceiving the sesation properly.
The nerve inflammation can be due to the spine arthritis, herniated disc or even viral infection.
Shingles for example is another possibility but usually blisters also present.
You should see your doctor for clinical evaluation.
Symptoms can be controlled by topical capsaicin ointment application sparingly available over the counter.
Prescription medications-- gabapentin, lidocaine gel, amitriptyline can be used effectively.
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