A common cause for pain during urination, especially soon after the urination has been initiated, is urinary tract infection.
You may have an inflamed bladder as a result of using some medications, or you may have a kidney stone stuck near the opening to the bladder.
You may have a ovary cyst pressing onto the bladder, causing urinary symptoms.
Infected or inflamed vagina can be painful due to touch with urine.
Being sensitive to chemicals in certain products, such as douches, soaps, scented toilet paper, personal lubricants, or contraceptives like foams, sponges, and the sperm killer nonoxynol-9, could be a reason, too.