Fecal occult blood 2+ means that by routine stool test, if it is immunoassay, positive fecal occult blood suggests gastrointestinal bleeding, but it cannot diagnose the cause of the disease; if it is detected by chemical assay, in addition to suggesting gastrointestinal bleeding, it may also be caused by taking iron supplements. Stool routine test is a kind of examination method often used in clinical work, mainly used to understand whether there is bacterial infection, viral infection and parasitic infection in the digestive tract, as well as the color, quantity and quality of feces. Fecal occult blood is detected in the stool of the patient’s blood components, generally clinically considered dietary conditions and gastrointestinal bleeding, immunological method generally suggests gastrointestinal bleeding; if the chemical method of detection, when the patient consumes a large number of animal liver, blood products and other foods before the examination or the existence of peptic ulcer and other diseases, can lead to the occurrence of occult blood in the stool. When the patient test suggests that the fecal occult blood 2 +, it is recommended to adjust the diet and review the routine stool, gastroscopy, enteroscopy and other tests, to clarify the cause of fecal occult blood, timely treatment.