The correct use of mugwort salt pack is beneficial to the human body, but if patients use it without authorization and improper use can lead to the following hazards: 1, aggravate the disease: mugwort salt pack is mainly made of mugwort leaves mixed with coarse salt, in which mugwort leaves have the effect of warming menstruation, dispersing cold, relieving pain, etc., plus coarse salt to make it warmer and more effective, clinically mainly used to treat cold disease, if it is misused to treat heat disease, it will lead to aggravation of the disease. 2, burns: mugwort coarse salt pack needs to be heated, if the temperature of the mugwort coarse salt pack is not controlled when used, it is easy to cause burns due to high temperature; 3, allergic reactions: some people with allergies may have allergies to mugwort and coarse salt, such as no local test before use, large area use may appear itchy skin as well as rashes and other allergic symptoms. Therefore, it is recommended to follow medical advice to use mugwort and coarse salt pack correctly, which can effectively avoid its harm and give full play to its function. Before use, the surface will be slightly sprayed wet, heated by microwave or oven for 3-5 minutes, with the back of the hand to measure the temperature, the temperature is not particularly hot, you can pad the towel or direct hot compress on the surface of human skin, can effectively avoid burns, but also can be used with essential oils, the effect is better.