Dandelion is cold in nature and should not be used in large quantities for a long time. There is no clear limit on how long it can be used at most, but it is recommended to follow up after one month of use and adjust or change the medication according to medical advice. Gastritis is an inflammation of the gastric mucosa caused by various reasons, and dandelion has the effect of clearing heat and detoxifying, antibacterial and anti-inflammatory, which can play a certain auxiliary therapeutic role. However, it is not recommended that patients drink too much or often dandelion water because it can easily stimulate the stomach and intestines and damage the spleen and stomach yang energy, resulting in malfunction of the spleen and stomach transport and transformation, which may lead to stomach pain, acid reflux, abdominal pain, diarrhea and other adverse reactions, which is not good for health. Therefore, patients are advised to follow medical advice on medication and to visit the Chinese medicine department or gastroenterology department after drinking dandelion water for one month. In conclusion, patients with gastritis should seek medical advice and undergo standardized treatment under the guidance of a doctor, and not drink dandelion water on their own. In addition, patients should also pay attention to a regular, light diet, quit smoking and avoid alcohol, and pay attention to rest.