Weak positive fecal occult blood refers to the amount of blood in the stool is less than 5 milliliters, may be caused by eating pig’s blood, taking stimulating drugs, but also may be caused by colitis, hemorrhoids, peptic ulcer, digestive tract tumors and other factors. If the last few days eating duck blood, pig blood and other animal blood products, do fecal occult blood test may appear weak positive, this situation is a normal physiological phenomenon, do not worry too much, food digestion and absorption of fecal discharge, occult blood can be negative. Taking aspirin and other drugs, stimulate the gastrointestinal mucosa, resulting in a small amount of bleeding, usually stop taking drugs or change drugs will be relieved. An immunoassay fecal occult blood test, on the other hand, can rule out the effects of diet and drugs such as iron and bismuth. There may also be inflammatory diseases such as peptic ulcer, colitis, ulcerative colitis, etc., which cause bleeding of the gastrointestinal mucosa under the stimulation of inflammation, and may be accompanied by symptoms such as abdominal pain and diarrhea. Hemorrhoids causing difficulty in defecation and bleeding from anal tearing may also show weak positive fecal occult blood. Fecal occult blood weak positive exclude eating and other physiological reasons, but also may be caused by other reasons, we should consult a doctor in time, under the guidance of the doctor to identify the causes, timely treatment.