Background: The objective of our research: survey and clinical features of subclinical lower gastrointestinal bleeding from the intestine, the rate determined the cause of lower gastrointestinal bleeding from the intestine. Methods: Research methods conducted by the method reported mass shift Results: Research for 36 patients, the rate of disease in men having higher female: 1.57 / 1, mean age: 47.6 ± 19.4, most patients from the provinces 63.9%, in Hồ Chí Minh City 36.1%.