Pain inside the penis and white discharge when urinating may be due to urethritis, urethral calculi combined with infection. 1. Urethritis: bacteria or other pathogenic bacteria from the urethra retrograde infection caused by inflammation of the urethra, may lead to pain in the penis, white discharge when urinating, most of them will also be accompanied by urinary frequency and urgency and other symptoms. 2. Urethral stones combined with infection: urinary stones may be smaller stones in the discharge process, stuck in the penis in the urethra, can also lead to pain in the penis as well as urinary difficulties, combined with the infection will appear white discharge. Pain in the penis, white discharge when urinating, there may be other reasons, you need to go to the hospital in time to check, clarify the cause of the disease, follow the doctor’s instructions for treatment.