The answer is that it can cause. Repeated bleeding hemorrhoids over a long period of time can cause severe anemia. The main symptoms of hemorrhoids are prolapse and blood in the stool. Blood in the stool mainly appears as blood in the stool without pain. It bleeds during or after a bowel movement, or adheres to stool, or there is blood on hand paper, or drips, or squirts blood like a syringe. Various types of anemia due to bleeding hemorrhoids are often seen in the clinic. The degree of anemia can be roughly determined by the hemoglobin in the blood routine. A hemoglobin above 9O is mild anemia, between 90 and 60 is moderate anemia, and below 60 is severe anemia. In the case of moderate to severe anemia, you may see a yellowish face, pale, florid, pale lips and nails, and even dizziness, weakness and lack of energy. In case of hemorrhoid surgery, blood transfusion may be required before surgical treatment. Otherwise, the risks of surgery and anesthesia are increased.