Cao Guo has the effects of drying dampness and warming the middle, removing phlegm and intercepting malaria. It is mainly used as a decoction in water. Cao Guo is the dried mature fruit of Cao Guo, family Zingiberaceae. It is pungent in taste and warm in nature, and belongs to the spleen and stomach meridians. It is mainly used for the treatment of abdominal pain, nausea, vomiting and diarrhea caused by cold and dampness in the middle Jiao; it can also be used for the treatment of malaria. It is used for the cold pain in the epigastric and abdominal regions caused by cold-dampness, vomiting and diarrhea, and cloudy and greasy tongue, etc. It is often combined with Cornus officinalis, dry ginger, and sand nuts. For the treatment of malaria with cold and dampness, it is paired with Changshan, betel nut and other traditional Chinese medicines. Cao Guo is warm in nature and should be used with caution in cases of yin deficiency and blood dryness. When discomfort occurs, it is necessary to consult a doctor and choose medication under the doctor’s guidance, and not to use medication on one’s own.