Bleeding from internal hemorrhoids, also known as rectal bleeding, is a common primary symptom in patients with internal hemorrhoids. Although the bleeding from internal hemorrhoids is painless and not itchy, it occurs during bowel movements and can be either a trickle or a spray of blood. Although the amount of bleeding might not be large and may subside naturally, in clinical practice, we have seen a minority of patients with long-term chronic bleeding leading to severe anemia. For example, the normal hemoglobin level in adults should be 120g/L, but at the time of consultation, their hemoglobin has dropped to 30, 40, or 50g/L. Treatment then requires an initial blood transfusion followed by surgery, which can be quite complicated. Therefore, bleeding from internal hemorrhoids should be taken seriously.