The bad out of squatting toilets for a long time, there are three main points: First, squatting toilets for a long time is easy to compress the sciatic nerve, causing numbness and weakness in the legs. Second, when squatting the toilet for a long time, because the veins around the rectum do not have venous valves, so it will lead to blood stagnation, causing hemorrhoids. Third, squatting the toilet for a long time can cause impaired reflux in the veins of the lower limbs, causing local edema. With the prolongation of time will gradually appear the problem of valve function, resulting in varicose veins, and squatting toilet for a long time, due to the loss of the role of the calf muscle pump, resulting in impaired reflux, gradually will aggravate the degree of edema as well as valve insufficiency, and cause serious varicose veins or venous / superficial vein thrombosis.