Medicinal bath refers to the fitness method of adding decoction or immersion liquid of medicine to bath water, or directly bathing the whole body with traditional Chinese medicine steam or fumigating the affected area. In addition to its own physical and chemical functions, medicinal bath mainly makes the effective components of drug aqueous solution enter the body through the body surface and respiratory tract to play a role.

Pharmacological research has proved that the drug taste can increase the content of some beneficial substances in the blood after entering the human body, thus achieving the purpose of preventing diseases and strengthening the body. Ancient health care experts also realized the health care function of medicated bath. "Lao Lao Heng Yan Toilet" records: "On February 2 nd in spring, there is a bath in Lycium barbarum soup, which makes people not sick or old." Folk spiced soup in the Spring Festival and finger soup in summer are all representatives of this kind.