Pelvic fluid sleeping position is best to choose semi-recumbent position or side-lying position, which can be conducive to the absorption of pelvic fluid and relieve pain. Pelvic fluid refers to the accumulation of body fluids in the pelvic cavity due to various reasons, which is common in pelvic diseases such as pelvic inflammatory disease and ectopic pregnancy, and can appear during menstruation and ovulation. Due to the special structure of the pelvic cavity, it results in the accumulation of fluid not being easily absorbed. Therefore, semi-recumbent position or side-lying position can gather the effusion together and facilitate absorption. In addition, if the pelvic inflammation is caused by pathologic factors, adopting the semi-recumbent position or lateral position can effectively relieve pain, promote absorption and prevent bacterial growth. Therefore, when pelvic effusion occurs, adopting a suitable sleeping position is conducive to the recovery of the disease.