It will definitely hurt a little, but if you have to use it, there is nothing you can do but endure it. However, I suggest that you do not use kaisailu as a last resort. You can see more at ordinary times and learn more about health knowledge. It is best to keep fit with food, drink more water and exercise more. Stick to it for a month and you will see obvious changes, but only if you stick to it. It may be difficult, but these are better than taking medicine.