This document discusses the causes of hydrosalpinx, a condition that can lead to female infertility. It states that hydrosalpinx occurs when the fallopian tubes become blocked or inflamed, preventing eggs from reaching the uterus. Potential causes mentioned include pelvic infections from unclean sex or hygiene, tissue adhesions after infections or surgeries, nearby organ infections, and an irregular lifestyle with little rest. Treatment of hydrosalpinx is recommended to avoid infertility, and herbal medicines like Fuyan Pill are presented as a natural option.