Pelvic fluid accumulation of 16mm is not normal, normal does not exist. First of all, we should determine whether it is physiological pelvic fluid or pathological fluid, if it is physiological fluid, the examination is after ovulation, there is the rupture of follicular fluid, there may be fluid accumulation. The examination should be carried out 3-7 days after the menstrual period is clean, when the effusion suggesting 16mm is more, and should be regulated by oral medication. For example, kunfu kang capsule or pelvic inflammatory net capsule, or rectal administration of sunflower brand rehabilitation anti-inflammatory suppository. If there are conditions, you can go to the hospital combined with pelvic physical therapy, the effect will be better, will achieve the purpose of treatment. The treatment may need process, probably need about 3 months, according to their own situation to decide the time of medication.