Ascites after transplantation may be caused by ovarian hyperstimulation syndrome. When ovulation was promoted prior to transplantation, there may have been multiple follicles developing in the ovaries, increased estradiol, and then HCG was used to promote ovulation as the follicles matured, so there may have been ovarian hyperstimulation, with enlarged ovaries, increased ascites, and possibly hemoconcentration and thrombosis. This symptom may continue to worsen after pregnancy and ascites continues to increase, and this occurs in patients with polycystic ovary syndrome, as well as in patients who are thin and have good ovarian reserve function. If ascites, dyspnea, enlarged ovaries, and extraordinarily high estrogen are present, hospitalization is necessary to prevent thrombosis, which can jeopardize the safety of the mother and child. If ascites worsens and cannot be controlled, medication such as albumin is required.