Its pathogeny is intricate, but clinical common causes are mainly due to diseases of ovary and uterus, especially ovary standstill, persistent corpus luteum and endometritis.

• 其病因错综复杂,临床常见的主要由子宫和卵巢疾病引起,两者又以子宫内膜炎、持久黄体和卵巢静止性不孕更多见。