Foot bath is one of the contents of pedicure in traditional Chinese medicine, and it is also a commonly used external treatment. The history of foot bath is thousands of years, and the earliest literature record is "Elbow Reserve Emergency Prescription" in Jin Dynasty, which has a history of more than 1000 years. Foot is also called the second heart of human body, because scientific research has proved that human feet have reflex zones corresponding to various organs and meridians, and soaking feet with warm water can stimulate these reflex zones.
When you soak your feet in hot water, you will find that the blood vessels on your feet will expand and the epidermis of your feet will turn red. This is because hot water will accelerate the blood circulation of the feet, make more blood flow to the peripheral blood vessels of the lower limbs, and make the blood flow of the brain relatively reduce, thus making people feel sleepy. At the same time, because countless nerve endings on the soles of the feet are closely connected with the brain, the warm stimulation of hot water on the nerve endings on the feet can inhibit the cerebral cortex and make people feel comfortable and relaxed in the brain, thus speeding up sleep and deepening sleep.