The main reason for boiling water to cure cough is due to the nature of eggplant, which is a cold vegetable, and its flesh contains a lot of juice, and often a lot of water will come out if you fry the eggplant side. In addition, the calyx of the eggplant, especially in the middle of the eggplant and the fruit, is more concentrated, unlike the fruit of the eggplant, which is completely a nourishing vegetable, that part has certain concentrated medicinal properties, it mainly has the effect of clearing lung heat. Because the taste of eggplant is relatively light, the flesh of the fruit is rich in mucus, so it can neutralize the taste of many of our regular meals, eating the heavy part of the taste. Because the lungs, the internal organs, are more afraid of thick tasting things when it comes to coughing, spicy, fresh and fragrant things are actually stimulating to the airways. The eggplant boiled in water has a relieving effect on the irritated part of the cough, and it also has a part in clearing heat, so it is used to cure the cough in this way.