Blood in the stool after drinking is a common disease, and many patients are unaware of the disease. Blood in the stool simply causes the body to lose a lot of iron, leading to iron deficiency anemia. When the anemia is more severe, there will be a lack of color, tiredness and fatigue, loss of appetite, palpitations, accelerated heart rate and shortness of breath after brawn activities, swelling and so on. Then how to diagnose blood in stool after drinking? Here is a specific look. The diagnosis of the blood after drinking 1, pay attention to the characteristics of the blood Understand the occurrence and development process of the blood. Internal hemorrhoids, anal fissure often bleeding after stool; chronic non-specific colitis, colon polyps, etc. is often repeated, intermittent small amount of blood; middle and late stage (colorectal) malignant changes can be a persistent small amount of blood. The blood in the stool can be distinguished by its nature, bleeding pattern, color and amount of bleeding. If the internal hemorrhoid bleeding is dripping or jet; anal fissure is blood attached to the surface of feces or handkerchief stained blood, the amount of bleeding is small; such as more bleeding, blood in the intestinal lumen storage, discharged can be black, consider the upper gastrointestinal tract lesions; if purple, dark red or clots; or blood bright red, more from the lower gastrointestinal tract; mixed with mucus and foul smell, should be thought of the rectal malignant lesions possible. 2, pay attention to the accompanying symptoms of blood in stool, such as proctitis, rectal polyps (cancer) and other blood in stool is often accompanied by anal drop, acute and severe; internal hemorrhoids, polyps, blood in stool without anal pain; anal fissure is accompanied by anal pain and constipation; chronic colitis is often accompanied by diarrhea, pain in the lower left abdominal region; hemorrhagic necrotizing colitis, intestinal volvulus is accompanied by severe abdominal pain, and even shock, etc..