The diagnosis of internal hemorrhoids is mainly based on symptoms and signs. Stage I internal hemorrhoids mainly show bleeding after stool in the form of dripping or spraying; Stage II internal hemorrhoids show bleeding after stool, accompanied by anal swelling prolapse after stool, which can be retrieved by oneself; Stage III internal hemorrhoids show reduced dripping of blood and anal swelling prolapse after stool, which needs to be retrieved by hand and does not reappear after retrieval; Stage IV internal hemorrhoids show anal swelling prolapse after stool, which reappears after retrieval by hand. Stage I internal hemorrhoids require anoscopic examination, which can see the anal cushion moving down, the surface of the hemorrhoid nucleus is congested, and some bleeding spots can be seen. Stage II, III, and IV internal hemorrhoids can be found in the perianal area with a bright red, soft, and non-tender swelling. In some patients, the swelling near the dentate line can be found by rectal palpation, which is soft, non-tender, smooth and blood-stained on the surface of the finger sleeve. If internal hemorrhoids become edematous, embedded or thrombosed, a swelling can be found in the perianal area and the diagnosis can be confirmed.