Hello, it's normal to have a stomachache or defecation reaction after using the old Beijing foot patch. You can try to observe the color. After using/kloc-for about 0/5 days, the defecation begins to turn dark or black, and after 2-3 days, the color will turn into banana color, which is not sticky or slippery. This is an effect of detoxification. The stool in the body is attached to the intestine for a long time and is toxic. Girls have spots or dull skin, mostly because of stool.