Cinnamon decoction decoction 3 to 5 minutes is the most appropriate, it is recommended not to exceed 10 minutes, the time is too long, easy to cause the volatilization of the drug, reducing the efficacy of the drug. Cinnamon is hot, pungent and sweet. Cinnamon has the effect of tonifying fire to help yang (supplementing the body’s yang qi), leading the fire back to the source, warming the meridians and veins, dispersing cold, pain relief, cinnamon can be used for the main treatment of lumbar and knee cold, impotence and cold uterus, kidney deficiency for asthma, deficiency of yang upward (relative deficiency of yang qi affecting the head and face), dizziness and redness in the eyes, the heart and abdominal cold (the location of the heart and abdominal cold), cold vomiting and diarrhea, cold hernia and abdominal pain (cold and cold viscera and the feeling of wind and cold external caused by the acute abdominal pain), menstrual cramps Menstrual cramps, dysmenorrhea, menstrual closure, etc. Note that this product is hot and pungent to deplete yin and move blood, so it is contraindicated for people with yin deficiency and fire (deficiency of yin and essence in the body, and hyperactive fire), people with bleeding tendency and pregnant women should be cautious, and it should not be used with chrysoprase. Because cinnamon contains volatile oil active ingredients, a long time decoction can easily cause cinnamon in the medicinal active ingredients to reduce, thus affecting the efficacy, so cinnamon usually need to be after the next, and the decoction time in the 3 to 5 minutes can be. Cinnamon need to pay attention to is that this drug has no adverse reactions, need to be under the guidance of a doctor for standardized use of drugs.