Excessive sweating and susceptibility to colds are mostly due to lung qi deficiency, which means the lung qi is damaged and insufficient. Why does lung qi deficiency lead to excessive sweating and susceptibility to colds? It is because when lung qi is damaged, the external defense becomes weak. Here we need to mention something called "wei qi." In clinical terms, "wei qi" refers to the body's resistance to diseases, especially external diseases. When this resistance declines, the skin's pores loosen, leading to sweat leaking out, resulting in spontaneous sweating. Under the condition of excessive spontaneous sweating, if the patient does not take proper care, they are more likely to catch a cold. Therefore, excessive sweating and susceptibility to colds are generally caused by lung qi deficiency.