Dear customers, first of all, thank you for choosing our Fuyuan slimming belt to heat subcutaneous tissue through far infrared resonance technology and pyroelectric technology. During menstruation, it is recommended to only use the "heating" file to warm the baby's abdomen, not the "vibration" file or medicine bag. If you don't understand anything, please contact our customer service, and we will answer your questions online. The picture below is a screenshot of the product manual for your reference! Wish you a happy life!