Yamada type 1 intestinal polyp refers to the endoscopic appearance of a polyp, a flat polyp that is more likely to be benign. Yamada type 1 intestinal polyps are categorized according to the Yamada typing method for the type of polyp. They are usually divided into 4 categories. Type 1 polyps are usually benign and have a flat shape with a broad base, and the color is very similar to that of the normal colon mucosa, and are rarely cancerous. Patients with Yamada type 1 intestinal polyps are usually asymptomatic, mostly found during physical examinations, but as the disease progresses, symptoms such as abdominal distension and pain, diarrhea, and abnormal bowel movements may occur. Pathologic examination of the polyps through local tissue removal is required to determine whether they are benign or malignant. Patients with Yamada type 1 intestinal polyps are advised to go to the hospital for a comprehensive examination in a timely manner and follow the doctor’s instructions for regular follow-up colonoscopies to avoid aggravation of the disease.