Fennel, with pungent flavor and warm nature, belongs to the liver, kidney, spleen and stomach meridians. Fennel has the effects of dispersing cold, relieving pain, regulating qi and harmonizing the stomach. Fennel can be used clinically to treat cold hernia abdominal pain (acute abdominal pain caused by cold internal organs and external wind-cold), testicular drop, dysmenorrhea, cold pain in the abdomen, distention and pain in the epigastrium (stomach and abdomen), and vomiting and diarrhea with little food. Fennel treatment of cold condensation gas stagnation in the liver of cold hernia abdominal pain, often with Wu Yao, Qing Pi, Gao Liang Jiang and other drugs such as Qi dispersal of cold; can also be used alone with the drug fried hot, wrapped in a cloth to warm iron the abdomen, if stagnation of obvious, abdominal distension and pain, can be accompanied by wood, neem seeds. In addition, fennel can be used to treat cold pain in the epigastric region (cold pain in the stomach and abdomen) with galangal, mother cloves and licorice. It is contraindicated in cases of Yin deficiency and fire exuberance. Patients who need to use the medication should be under the guidance of a doctor and should not use the medication without authorization to ensure the safety of the medication.