Fire is a Chinese medicine concept that is a problem with how a person feels, for example, feeling hot and dry, frequent mouth ulcers, dry mouth and thirst, and irritability (irritability and sultriness), which may be caused by fire. Consider it to be related to emotional problems, dietary factors, and excessive fatigue. 1. Emotional problems: Long-term bad emotions, such as excessive stress in work and life, emotional irritability, frequent overtime work and staying up late, and too many trivial things at home lead to exuberant liver fire, which may cause fire. 2. Dietary factors: everyone’s diet is different, if you often intake of spicy stimulation, greasy food, like smoking and drinking, may lead to stomach fire. 3. Excessive fatigue: Frequent overtime and late nights, high-intensity exercise, heavy physical labor, and excessive indulgence may lead to Yin deficiency and internal heat, making it easy to catch fire. It is recommended to take a light diet, increase the amount of water intake, and if necessary, go to the internal medicine department of traditional Chinese medicine, combined with the doctor’s advice to regulate.