I find this article interesting! It talks about women who have unexplained Endometriosis (Endometriosis which does not show up on scans).
It may be because the patient is suffering from Pelvic Congestion Syndrome (PCS) or Pelvic Venous Disorder (PVD) which can cause painful sex, menstruation, pain after prolonged sitting or standing, painful urination.
Hope the information will be to your benefit.
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