Chuan Wu belongs to the category of dispelling wind-damp herbs in traditional Chinese medicine, and its function is to dispel wind and cold, remove dampness and relieve pain. Chuan Wu is mainly used to treat various kinds of pain caused by external wind-cold-dampness, such as headache, joint pain, chest and abdominal pain, etc. It can also be used to treat coldness in the extremities caused by cold evil in the meridians. Chuan Wu is hot in nature, pungent and bitter in taste, and belongs to the liver, kidney, heart and spleen meridians. It is often combined with ephedra and astragalus in the treatment of cold and damp pain. It is used to treat the symptoms of middle wind due to meridian blockage, mostly with Di Long, Centipede and Boswellia. It can be taken as a single decoction for the treatment of hernia and cold pain in the abdomen, and can also be used for local anesthesia to relieve pain. Note that this product is highly toxic and can only be used externally if used raw, and cannot be taken for a long time to avoid poisoning, and should not be taken by pregnant women.