Some level of discomfort may be experienced while using a nipple pump, but it should not be unbearable or cause lasting pain. The sensation of suction can be intense for some individuals, especially if they are new to nipple play. If you experience significant discomfort or pain, stop using the nipple pump immediately and reassess the suction strength or your technique. Communicate with your partner about your comfort levels, and always prioritize safety and consent during any sexual activity.