Fennel in water has the effect of warming the kidneys and the liver, moving qi and harmonizing the stomach (by promoting the operation of qi to harmonize the stomach and internal organs) and relieving pain. Fennel is the dried mature fruit of fennel in the family Umbelliferae. Fennel has the effect of warming the kidneys and the liver, promoting qi and stomach to relieve pain, and is often used to treat cold hernia and abdominal pain (acute abdominal pain caused by internal cold and external wind-cold), cold pain in the epigastrium (cold pain in the epigastric and abdominal regions), kidney deficiency and lumbar pain, poor appetite and vomiting and diarrhea, and menstrual cramps. Fennel in water has limited precipitated ingredients and is not as effective as soup in treatment. It should be noted that fennel is warm in nature and is contraindicated for people with yin deficiency (deficiency of yin and essence in the body, resulting in hyperactivity of deficiency fire). It is recommended to use fennel under the guidance of a Chinese medicine practitioner and not to take it on your own.