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your prior history of urine ablation 5 years ago can cause fluid in the uterus now.
having an IUD can cause some fluid in the endometrium .
some of that fluid in the endometrium can be blood or cold blood.
how old are you? sometimes in rare cases that fluid can get infected in the uterus and cause tenderness.
you may need a uterine biopsy or sampling of that uterine fluid.
or a course of antibiotics and see if that helps
you may need a hysteroscopy procedure to look inside of the uterus to drain out old fluid or old blood in the uterus.
that could help resolve the pain coming from the uterus.
you may need to have your IUD replaced or removed as well.