Rectal bleeding is the primary clinical manifestation of internal hemorrhoids. When rectal bleeding occurs, it's essential first to rule out whether the bleeding is definitely from internal hemorrhoids because rectal bleeding can be caused by many diseases, including malignant tumors. Once it's determined that the bleeding is from internal hemorrhoids, it is important to pay attention to whether the volume of blood is large, the duration of bleeding is long, and the frequency of bleeding is high, and whether there is frequent or daily bleeding. If so, it will exceed the body's ability to replenish blood through its hematopoietic function, leading to severe systemic anemia.