Cinnamon is pungent, sweet and hot in nature, and belongs to the kidney, spleen, heart and liver meridians. Cinnamon is a warming herb with pungent, sweet and great heat in nature, and sweetness can tonify. It has the functions and efficacy of tonifying fire and helping yang, dispersing cold and relieving pain, warming the meridians, and inducing the fire to return to the source (inhibiting the fire-evil from rising in the kidneys). Cinnamon can be used to treat kidney yang deficiency symptoms, such as impotence, uterine cold, cold pain in the waist and knees, and frequent urination, etc. It can also be used to treat cold pain in the epigastrium (cold pain in the stomach and abdomen), cold hernia and abdominal pain (acute abdominal pain caused by coldness and deficiency of the internal organs and the feeling of wind and cold from the outside), and it can also be used to treat cold paralysis and lumbago, paresis of the chest (chest tightness and pain), menstrual cramps, redness in the face, sweating, and palpitations. The adverse effects of cinnamon have not been clarified. This drug is contraindicated in cases of yin deficiency and fire, solid heat in the interior, blood-heat paranoia (abnormal outflow of blood caused by heat), bleeding, pregnant women, and those who are allergic to this drug, and this drug should not be used together with red stone resin. Chinese medicines need to be used under the guidance of a TCM doctor’s diagnosis, do not use the medicine privately, so as not to cause damage to the organism.