After ovulation, there will be fluid in the pelvis, but the amount of fluid is relatively small and will not cause discomfort. Due to follicular rupture, a small amount of follicular fluid will enter the pelvic cavity, easy to cause pelvic effusion, is no need to treat is, can be self-absorbed, recommend regular review ultrasound. If the pelvic fluid is more than 10mm, it is considered to be pathological, which may be caused by pelvic inflammatory disease, endometritis, tubal inflammation, and if there is tuberculosis or tumor in the pelvic cavity, pelvic fluid will also appear. If pelvic fluid is caused by inflammation, tumor or tuberculosis, it is easy to cause pain in the lower abdomen, and in serious cases, it will cause fever, and further examination is needed. If it is inflammation, you need to take anti-inflammatory drugs such as metronidazole and amoxicillin; if it is a tumor, you need to remove it surgically; if it is caused by tuberculosis, you need to take anti-tuberculosis drugs reasonably; you need to take the drugs early, in combination, in the right dosage, and in a regular manner throughout the whole course of the treatment.