Cordyceps belongs to a kind of yang tonic, yang qi insufficiency eating cordyceps is useful, but need to be under the guidance of a physician. Cordyceps, as a traditional Chinese medicine, is sweet in taste and flat in nature, and belongs to the lung and kidney meridians, which can tonify the kidney and benefit the lungs, stop bleeding and resolve phlegm, and is mainly used in the treatment of kidney deficiency and essence loss, impotence and spermatorrhea, lumbar and knee pain, cough and asthma caused by deficiency of the lung and kidney, coughing and hemoptysis due to strain and bleeding and other medical conditions. The adverse effects of this drug are not clear. This drug has a strong yang tonic effect and should not be taken for a long time. Yang Qi deficiency belongs to yang deficiency and needs to be tonified, so it is possible to use Cordyceps Sinensis to treat it. Before use, it should be guided by a professional Chinese medicine practitioner after identification, if there is any discomfort after taking the medicine, it should consult a doctor in time to avoid adverse consequences.