I would certainly consider an infection first - since this is not an uncommon cause. The urine can be sent for a simple urinalysis to evaluate this.
Any type of prostatic enlargement can cause various changes in the urinary pattern. Your doctor can do a digital rectal exam to feel the prostate to see if this is the case.
If these tests are non-revealing, you can consider more specialized testing to evaluate if there are any anatomical abnormalities that can lead to your symptoms. This can include a cystoscopy to evaluate the lower GU tract.
These options can be discussed with your personal physician or in conjunction with a urology evaluation.
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