People with stomach problems can eat fennel, but should not eat too much. Fennel has the efficacy of dispersing cold and relieving pain (relieving pain by removing cold from the body), regulating qi and stomach, and is used to treat cold hernia and abdominal pain (acute abdominal pain caused by cold internal organs and external wind and cold), testicular drop, menstrual cramps, cold pain in the abdomen, distension of the epigastric region (abdomen), and vomiting and diarrhea with low food intake. So patients with stomach problems can eat fennel, but excessive consumption may stimulate increased secretion of gastric acid, causing a burden on the stomach and intestines. For people with a hot constitution and yin deficiency and hyperactivity (deficiency of yin fluid and hyperactivity of yang), fennel should not be eaten too much, as eating too much of it will cause symptoms such as sore throat, irritability and headache. In addition, psoriasis, urticaria, etc. in the acute stage of redness, swelling, oozing can not eat fennel, so as not to aggravate the condition. Patients with stomach problems should not eat spicy stimulation, greasy, indigestible food, and diet can consult a professional doctor, if not adapt to go to the hospital in time.