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肛管皮肤下的肛管静脉(痔下静脉)曲张形成的静脉团称为外痔,血栓外痔实际上是外痔最常见的一个合并症,并非外痔的一个类型。病因:外痔发生血栓的原因尚不明确,有两种可能。其一,外痔形成后,肛管静脉已经曲张成团,静脉血回流不畅,静脉内压已有增高。便秘时用力排便,或剧烈的运动,剧烈的咳嗽,致静脉内压更高,静脉破裂,血液外渗至结缔组织内形成凝血块,同时静脉内有血栓形成。其二,因静脉扩张,血液淤滞,痔静脉团发生急性血栓性静脉炎,
Anal canal under the skin of the anal canal (hemorrhoids vein) varicose vein group called external hemorrhoids, thrombus external hemorrhoids is actually the most common complication of external hemorrhoids, not a type of external hemorrhoids. Etiology: The cause of thrombosis in external hemorrhoids is not clear, there are two possibilities. First, after the formation of external hemorrhoids, the anal vein has been varicose into groups, poor venous return, intravenous pressure has increased. Constipation forced defecation, or intense exercise, severe cough, resulting in higher intra-venous pressure, venous rupture, extravasation of blood into connective tissue to form clot, while thrombosis in the vein. Second, because of venous dilatation, blood stasis, hemorrhoids venous mass acute thrombophlebitis,