Yes, I will sweat a lot after using it. I don't know if it's the decomposition of fat or just water. I didn't insist on using it, because my skin would itch and itch after using it, so I kept scratching and scratching, and then my skin became red and swollen, which was quite uncomfortable. I bought infrared rays. I don't know if there are any side effects, but I dare not use them now.