Cinnamomum cassiae is a kind of traditional Chinese medicine, a kind of cinnamon herb, which is processed to remove the cork skin. Cinnamon has the effects of tonifying fire to help yang (replenishing yang qi in the body), inducing fire to return to the source (inhibiting the rise of fire in the kidneys), dispersing cold and relieving pain (relieving pain by removing cold in the body), and warming the meridians. Cinnamon is pungent, sweet and hot, pure yang, warm and dispersing, and enters the kidney meridian. It can benefit fire and eliminate yin, replenish yang qi, and it is suitable for those who have insufficient fire in the lower jiao, and it is the key medicine for treating the fire failure of the life gate (the body is weak in kidney yang, and the function of warming and promoting the operation of qi and blood is lowered). If the treatment of kidney yang insufficiency (lack of yang energy of the kidneys), the waist and knee cold pain, impotence, cold uterus, dyspareunia, etc., often used in conjunction with the seeds, ripe earth. Cinnamon is hot and enters the kidneys, and can draw the fire that floats upward without a root due to the deficiency of the lower yuan to return to the kidneys. It is used for dizziness, redness of the face, asthma, weak pulse, etc. caused by deficiency of yin and yang, and the upward floating of deficiency yang (the relative deficiency of yang qi affecting the head and face). Cinnamon is hot and pungent and consumes yin to move blood, so it is not recommended for people with yin deficiency (deficiency of yin essence in the body and hyperactive fire), people with bleeding tendency and pregnant women should be cautious, and it should not be used with red stone resin. If there is a need for medication, consult a physician or pharmacist, do not blindly use medication on your own, resulting in aggravation of the condition.