The inside of the penis is painful and there is a small amount of pus considered to be caused by gonococcal infection due to gonorrhea urethritis, chronic prostatitis and other diseases. 1. Gonococcal urethritis is mainly transmitted through sexual contact. In the initial stage of infection, the patient will experience redness, swelling, itching and tingling of the urethra. The urethra will discharge a large amount of purulent secretions, and there will also be frequent urination, urinary urgency, obvious urinary pain, and even the appearance of hematuria. 2. Chronic prostatitis can also present such symptoms. The causative agent is mainly E. coli, and the general performance includes frequent urination, urinary urgency, urinary pain; there will also be pain in the lower abdomen, after urination, there will be pus discharge from the urethra and other symptoms. Once similar symptoms occur, you should go to the hospital immediately and avoid taking medication on your own. To be under the proper guidance of the doctor, follow the doctor’s instructions standardized treatment.