No, proper usage of the Absolute Intimate Penis Pump shall not cause any discomfort or pain, however, in case you had a longer period without sex, an infection or there is a swelling of the prostate gland, you might have pain or discomfort during ejaculation. If this happens, please keep using the Absolute Intimate Penis Pump and the symptoms shall go away. If the pain or discomfort continues, please consult with an urologist.