1, Ai Chen is actually mugwort. After the fresh leaves are dried in the shade, they are placed in a cool, dry and ventilated place, and the wormwood leaves are preserved for more than three years. The longer the leaves in Ai Chen, the better the effect. Among wormwood leaves, three to five years is the best, commonly known as "three-year Ai Chen" and "five-year Ai Chen".

2. The efficacy and role of Ai Chen

(1) Effect of expelling wind and cold: Ai Chen has the effect of expelling wind, dampness and pathogenic cold, and can be used to treat colds, fever and dizziness caused by exogenous wind-cold, as well as rheumatism and rheumatoid arthritis caused by exogenous wind-cold.

(2) Hemostatic effect: Ai Chen has a good hemostatic effect and can be used to treat symptoms such as menorrhagia and metrorrhagia in women.

(3) Effect of warming channels and relieving pain: Ai Chen can dredge channels and collaterals, promote blood circulation and remove blood stasis, and can be used to treat abdominal cold pain and female dysmenorrhea.