Adnexal cysts do not make the uterus bigger, and the causes of uterine enlargement are considered to be related to its own development, poor post-partum recovery, adenomyosis, and other factors. Adnexal cysts are fluid-filled sac-like structures that form in a woman’s fallopian tubes or ovaries. Most patients with adnexal cysts have no obvious symptoms, while a few patients with adnexal cysts may experience severe abdominal pain due to torsion, rupture, and infection. Normally, adnexal cysts do not cause the uterus to enlarge. Of course, the cause of uterine enlargement may be related to congenital developmental factors, and there may be individual differences. Some women may also have an enlarged uterus if their uterus does not recover well after childbirth. Adenomyosis may also cause uterine enlargement. It is recommended that patients should pay attention to either adnexal cysts or enlarged uterus, and actively cooperate with the doctor to clarify the cause of the problem and then do targeted treatment.