Chai Hu (柴胡) and Chuan Xiong (川芎) taken together have the efficacy of relieving exterior fever, dispersing the liver and relieving depression (treating depression by unblocking the liver’s qi), and dispelling wind and relieving pain (dispersing the wind evil and relieving pain in the tendons and bones). Chai Hu (柴胡) has the efficacy of relieving exterior fever, dispersing the liver and relieving depression, and elevating yang qi. It is mainly used in treating colds and fevers, cold and heat (the body is hot and cold at the same time), distension and pain in the chest and ribs, and menstrual disorders. Rhizoma Ligustici Chuanxiong has the efficacy of invigorating blood and promoting circulation of qi, dispelling wind and relieving pain, and is mainly used for treating chest paralysis (stuffy pain in the chest) caused by stagnation of the heart veins, and for treating distension and pain in the chest and ribs caused by stagnation of the liver. Chuanxiong should be used with caution in cases of yin deficiency and hyperactivity (deficiency of yin fluid and hyperactivity of yang), hyperactivity of liver yang (hyperactivity of liver yang, causing dizziness, dizziness, headache, etc.), yin deficiency and hyperactivity of fire (deficiency of yin essence and hyperactivity of deficiency fire in the body), and hyperactivity of qi; and it should be avoided in cases of yin deficiency and hyperactivity of yang with headache, and with caution in cases of excessive sweating and excessive menstruation. When using drugs, pay attention to the use of drug dosage and contraindications, need to be used under the guidance of a doctor, do not unauthorized use of drugs.