You can eat cool fruits, such as pears, watermelon and water chestnuts, and avoid hot fruits, such as durian and lychee, to avoid aggravating the symptoms. Fruits only have a certain toning effect, can not be used to treat the disease. Most of the heart fire is due to emotional, dietary, fatigue and external factors such as external evil, in the period of adjustment should pay attention to the dietary structure adjustment, it is recommended to choose a large amount of water content, cool fruits, such as watermelon, fresh pears, water chestnuts and so on. Can help the body to replenish water at the same time, there is a certain clear heat to reduce the role of fire, can relieve the symptoms of discomfort. Watermelon has a certain heat, quench thirst and diuretic effect; pears have a certain amount of zhengjin moisten dryness, heat and phlegm; water chestnuts have a certain amount of heat and cool the blood (with heat to relieve blood heat), phlegm, eliminating the role of accumulation. However, as a food, it only has a regulating effect and cannot be used as a substitute for medication in treating diseases. If you have symptoms related to heart fire, please consult a doctor and take medication as prescribed by the doctor.