可见肛门和肛周有明显的真性痔脱垂（内痔）。痔疮由扩张的黏膜下血管形成，此黏膜下血管可形成血栓和破损伴有血肿的形成。外痔形成超过内括约肌，在肛门边缘产生一个“急性隆起”。慢性便秘、慢性腹泻、怀孕和门静脉高压均能刺激痔形成。痔疮发痒、出血（在损伤过程中通常是鲜红的血）。
Seen here is the anus and perianal region with prominent prolapsed true (internal) hemorrhoids. Hemorrhoids consist of dilated submucosal veins which may thrombose and rupture with hematoma formation. External hemorrhoids form beyond the intersphincteric groove to produce an "acute pile" at the anal verge. Chronic constipation, chronic diarrhea, pregnancy, and portal hypertension enhance hemorrhoid formation. Hemorrhoids can itch and bleed (usually bright red blood, during defacation).
