Fennel is the fruit of Fennel, a plant of the genus Fennel in the Umbrellaceae. The parts used are leaves, flowers, stems, roots, fruits, and seeds. With fragrant qi, sweet taste, slight pungency, and warm nature, it has the functions of regulating qi, relieving pain, warming the middle and dispersing cold, warming the liver, strengthening the spleen, and tonifying the kidney. Fennel leaves and seeds have a digestive promoting effect and can treat headaches, toothache, indigestion, abdominal distension, vomiting, testicular tuberculosis, gastrointestinal cramps, and other diseases.