It is not suicide, but health preservation, which can promote blood circulation of feet, reduce local muscle tension, eliminate fatigue and improve sleep. "Washing feet with hot water is better than taking tonic." Soaking feet for 15 minutes every day can play a health care role. If you soak your feet in hot water at about 40 degrees Celsius, your headache will be obviously relieved after about 15 ~ 20 minutes. This is because the blood vessels in both feet dilate and blood flows from head to foot, which can relatively reduce brain congestion and thus relieve headaches. For the headache caused by cold and fever, soaking feet with hot water can also help reduce the fever. If you can massage Yongquan point while soaking your feet and press Taichong point on the back of your big toe, it will also help lower your blood pressure. Moreover, hot water soaking feet has a wide range of applications, including rheumatism, spleen and stomach diseases, insomnia, headache, cold, paraplegia, brain injury, stroke, lumbar disc herniation, nephropathy, diabetes and other systemic diseases, as well as rehabilitation after a serious illness.