Dry mouth after drinking mugwort water is mostly considered to be caused by fire. Ai Ye is warm in nature, pungent and bitter in flavor. Mugwort is warm and hot, and after taking the medicine, it can sometimes lead to the appearance of fire, or lead to the exacerbation of yin deficiency and fire, stomach fire, liver fire and other conditions, and the symptoms of dry mouth. Therefore, patients with Yin deficiency and blood heat, fire, dampness and heat, etc. need to be cautious of using mugwort leaves. Dry mouth can also be seen in the usual diet spicy stimulation, stay up late and tired, emotional fluctuations and other reasons. If there is a manifestation of fire, it is not recommended to continue to take the water of mugwort, which will lead to aggravation of the condition. Drug taking is recommended under the guidance of a professional doctor’s diagnosis, do not self-medication, so as not to delay the condition.