Yang qi shi and yin qi shi can be distinguished from the efficacy, main treatment, contraindications and so on. 1. Efficacy: both have a salty flavor and warm nature. Attributed to the kidney meridian. Yang Qi Shi has the efficacy of warming the kidney and strengthening the yang (warming and tonifying the yang qi in the kidney); Yin Qi Shi has the efficacy of warming and tonifying the life gate, dispelling wind and removing dampness (dispelling wind and dampness in the body), detoxifying and subduing swellings; Yang Qi Shi favors the strengthening of the yang to treat impotence and spermatorrhea of men, while Yin Qi Shi favors warming the kidney and warming the uterus to dispel wind and remove dampness. 2. Indications: Both are used in treating coldness in the lower jiao, kidney yang deficiency (deficiency of yang qi in the kidneys), cold paralysis of the waist and knees, impotence and spermatorrhea in men, infertility with coldness in the uterus in women, metrorrhagia (excessive menstruation or more than a few drops of menstruation), and obstruction in the abdomen. 3. Contraindication: Both are prohibited for people with yin deficiency and fire exuberance (deficiency of yin and essence in the body and hyperactivity of deficiency and fire), as both are mineral-based traditional Chinese medicines and should not be taken for a long period of time. Patients must consult a professional Chinese medicine practitioner before using the medicine, and must not use the medicine without authorization to avoid adverse consequences.