1. Tubal infection Tubal infection can cause adhesions in the luminal folds and partial obstruction of the lumen. 2, tubal tuberculosis As the tubal mucosa is conducive to the latent infection of tuberculosis bacilli, the tubercle bacilli first invade the fallopian tubes. Bilateral tuberculosis is predominant, with thickening and enlargement of the fallopian tubes and closure of their umbilical ends, resulting in tubal obstruction. 3. Endometriosis Endometriosis can cause adhesions around the fallopian tubes, distortion, stiffness and umbilical atresia of the fallopian tubes, resulting in narrowing or partial blockage of the fallopian tubes. Appendicitis, pelvic tuberculosis and peritonitis can cause peri-fallopian tube adhesions, tubal distortion, stiffness and umbilical atresia, resulting in tubal lumen narrowing or partial blockage or peristaltic abnormalities; pelvic tumor pulling and compression makes the fallopian tubes become elongated, tortuous or the lumen narrowed or partially blocked; tubal adhesion separation, recanalization and post-op cystostomy re-adhesion or scarring of the surgical site, tubal sterilization The formation of fistula or recanalization after surgery can cause partial obstruction of the fallopian tubes.