For normal people, fecal occult blood test can be performed once a year, but if patients have gastrointestinal bleeding, they need to perform fecal occult blood test every day. Fecal occult blood test is a kind of test to determine whether there is gastrointestinal bleeding according to the content of red blood cells in the stool. Common diseases with positive fecal occult blood test include hemorrhoids, intestinal cancer, gastric cancer, peptic ulcer and so on, and for the normal population, the test can be performed once a year. For patients with upper gastrointestinal bleeding and positive fecal occult blood, it is necessary to perform fecal occult blood test every day to clarify the current status of gastrointestinal bleeding, and when the fecal occult blood is negative, it can be checked once every three days. During the fecal occult blood test, it is important to reduce the intake of blood products such as duck blood and sheep blood to minimize the occurrence of false positive results. Consult a medical professional for the specific frequency of the test.