Infection would be something to rule out. Tests for STDs, such as gonorrhea and chlamydia (which can be done via a urine test or urethral swab) as well as a urinalysis can be considered.
If negative, anatomical abnormalities - such as a urethral stricture or urethral polyps - can all cause the symptoms. The most comprehensive test would be a cystoscopy for evaluation and this can be discussed with your personal urologist.
If everything is negative, you can consider a neurology referral to evaluate for any nerve dysfunction.
Followup with your personal physician is essential.
This answer is not intended as and does not substitute for medical advice - the information presented is for patient education only. Please see your personal physician for further evaluation of your individual case.
Kevin, M.D.
Medical Weblog:
kevinmd_b