The normal value of urea 14C breath test is 0~100dpm. Urea 14C breath test is a common clinical method used to detect the presence of Helicobacter pylori in the stomach, less than 100dpm is negative, indicating that there is no Helicobacter pylori infection; more than 100dpm is positive, suggesting that Helicobacter pylori infection. Infection with H. pylori can cause inflammation of the gastric mucosa, leading to gastric and duodenal ulcers and gastric cancer. It can be relieved by taking quadruple drugs such as amoxicillin, metronidazole, bismuth potassium citrate and omeprazole. Some patients experience adverse reactions such as diarrhea, nausea, dizziness, and headache. It is contraindicated in women who are allergic to antibiotics, pregnant and lactating. Patients with urea 14C breath test greater than 100dpm should go to regular hospitals for timely consultation and treatment under the guidance of professional physicians, and should not be used blindly on their own.