The lung is responsible for breathing, and the lung is an important link in the formation of qi. In the whole process, the subtle nutrients absorbed by the spleen and stomach are combined with the clear qi of lung breathing to form the middle qi, so any link in this process is out of order, which will easily lead to spleen and lung deficiency and middle qi deficiency.

Although the middle qi is located in the middle jiao, it can nourish the whole body through the output circulation of the heart and lungs, which is an important basis for the formation of the body's defensive qi. Defending qi can resist exogenous pathogens and protect the muscle surface. If the middle qi is insufficient, it is easy to form spontaneous sweating, easy to be afraid of cold, easy to catch a cold, short of breath and fatigue.

In the case of nursed back to health, the key point is to nourish the spleen as the foundation of the day after tomorrow, and to supplement the qi in the middle and strengthen the qi in the health. Buzhong Yiqi Pill, Yupingfeng Powder and other prescriptions can be used to replenish middle qi, replenish qi and consolidate exterior, and dispel pathogenic wind, which is an enduring prescription for clinical use. If spontaneous sweating is obvious, drugs such as floating wheat, keel, oyster and ephedra can be added on the basis of the above prescriptions to strengthen the effect of astringency and antiperspirant.

Besides, in daily life, it is important to avoid cold, strengthen physical exercise, enhance lung function and cultivate acquired strength.

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