When tubal fluid buildup occurs, ultrasound cannot show it if the amount of fluid is relatively small, and if the amount of fluid is large, ultrasound will show it as a streaky, liquid dark area. Tubal fluid is caused by ectopic pregnancy, infection in the uterine cavity, etc. If the amount of fluid is relatively small, it will not affect the pregnancy and the ultrasound may not show it. If the amount of fluid is large, it will have an effect on pregnancy, and the ultrasound will show a fluid dark area in the form of streaks, which needs to be actively treated. If a woman has hydrosalpinx, it is recommended that she go to the hospital in a timely manner and receive standardized treatment under the doctor’s guidance to promote relief of discomfort and provide adequate conditions for a normal pregnancy in order to promote a successful pregnancy.