Chaihu has the effects of dispersing wind and reducing fever, relieving the liver of depression (treating depression by unblocking the liver’s qi), and elevating yang qi. It is mainly used in the treatment of superficial symptoms of external infection (mainly manifested as respiratory symptoms after feeling external evil) or Shaoyang syndrome, which means that the patient can be seen to suffer from malignant cold (fear of cold), fever, or chills and fever (the body is hot and cold at the same time), and pain in the head and body; and it can be used in the treatment of abdominal distension and depression due to liver qi stagnation (the liver’s qi and blood are not transported smoothly, and the emotions and moods are depressed). It can also be used in combination with astragalus and other drugs to treat conditions such as prolapsed organs. Contraindications and side effects: Chai Hu is prone to damage liver yin, so it is contraindicated in patients with internal movement of liver wind and yin deficiency and fire (deficiency of yin and essence in the body, resulting in hyperactivity of deficiency and fire); drowsiness, abdominal distension and loss of appetite may occur with large doses of Chai Hu; as Chai Hu has the efficacy of elevating and lifting up the liver, it is contraindicated in patients with upward reversal of qi.