子宫内膜息肉，为子宫内膜局限性增长，在宫颈内形成息肉样突起。

其发病原因包括两类，一个是机体一系列功能紊乱。另一个为子宫内膜基底层发生的小肿瘤，增殖发育进入内膜功能差，月经期也未能剥脱，继续发育到子宫腔内形成息肉。

子宫内膜息肉可为单发或多发，外观呈圆形、长圆形或舌形等，直径最小仅1—2mm，偶有大至数厘米者。除少数基底较宽外，大都有蒂，有时可自颈管脱垂于阴道内，息肉呈粉红色。如有出血坏死，可呈暗红色。当合并感染，可见渗出液或脓苔样物覆盖其表面。

An endometrial polyp or uterine polyp is a mass in the inner lining of the uterus. They may have a large flat base (sessile) or be attached to the uterus by an elongated pedicle (pedunculated). Pedunculated polyps are more common than sessile ones. They range in size from a few millimeters to several centimeters. If pedunculated, they can protrude through the cervix into the vagina. Small blood vessels may be present, particularly in large polyps.