Cinnamon warms the spleen and stomach, disperses cold and relieves pain (relieves pain by removing cold from the body). Cinnamon is the dried bark of Cinnamomum cassia, family Camphoraceae. It has a pungent, sweet flavor and is very hot in nature. It belongs to the kidney, spleen, heart and liver meridians. It has the effects of tonifying fire to help yang (replenishing yang qi in the body), inducing fire to return to the source (inhibiting the rising of fire evil in the kidneys), dispersing cold and relieving pain, and warming the meridians. Cinnamon can be used for impotence, coldness in the uterus, cold pain in the waist and knees, asthma due to deficiency of the kidneys, deficiency of yang (relative deficiency of yang affecting the head and face), dizziness, coldness in the heart and abdomen (cold pain in the heart and abdomen), vomiting and diarrhea due to deficiency of coldness in the internal organs, coldness of the wind and coldness of the external organs that cause acute abdominal pain and dysmenorrhea and menstrual pain and menopausal closure. Cinnamon is beneficial to fire and yang, hot and pungent yin and blood, so yin deficiency fire (Yin essence loss in the body, the emergence of hyperactive fire) should not be served, bleeding tendency to be used with caution; pregnant women should be used with caution; cinnamon should not be used with the red stone resin. It is recommended to use the drug under the guidance of a doctor.