The purpose of this study was to consider the cause of bilateral lower abdominal pain for the fallopian tubes in pelvic congestion syndrome after oviductal ligation, we collected resected tubes of eight patients with this disease, from January, 1992 to October, 1993. Under ultrastructural observation, the changes in these specimens showed a marked swelling of the C-type unmedullated nerves fibers, the axoplasm decreased in density, decrease in number of microtubules and microfilaments. Furthermore, it is re...