prolapse of rectal mucosa

例句：

1. 1.The patient had a prolapse of the rectal mucosa, which required immediate surgery.
   患者患有直肠黏膜脱垂，需要立即进行手术。
2. 2. Prolapse of the rectal mucosa can be caused by a variety of factors, including aging and straining during defecation.
   直肠黏膜脱垂可能由多种因素引起，包括年龄和排便时的用力。
3. 3. In some cases, prolapse of the rectal mucosa may lead to complications such as incontinence or pain.
   在某些情况下，直肠黏膜脱垂可能导致并发症，如失禁或疼痛。