Why does it occur?

The most widely accepted theory is retrograde menstruation. According to this theory some of the menstrual blood flows backwards down the fallopian tubes and into the pelvis. Some of the endometrial cells, contained in the menstrual fluid, implant on the reproductive organs or other areas in the pelvis. These implanted cells cause endometriosis. What is not known is why these endometrial cells implant in some women and not in others.

Other theories are:

  • Lymphatic or circulatory spread
  • Genetic predisposition to the condition
  • Immune dysfunction
  • ​ Environmental causes – such as dioxin exposure
  • What is Endometriosis
  • Why does it occur?
  • Symptoms of Endometriosis
  • How is Endometriosis diagnosed?
  • Treatments
  • Medical Treatments
  • Surgery
    • Due date & Gestational age based on period

      Due date & Gestational age based on period

      Due Date Calculator based on Last Menstrual Period (LMP).
      Enter the first day of your Last Menstrual Period and the length of your cycle in order to estimate your Due Date and the gestational age at present.
      Note, all dates given are estimates; We will give you a more accurate indication of your due date when you have your 7-10 week ultrasound scan.

      Enter first day of last menstrual period:

      Length of menstrual period cycle:

    • Gestational Age based on Due Date

      Gestational Age based on Due Date

      Gestational Age based on the Due Date
      If you know your due date, you can calculate how many weeks of pregnancy you have completed so far.

      Enter your due date:

    • Fertility calculator

      Fertility calculator

      Enter the date of your last menstrual period and the length of your cycle to show the period at which you are most fertile.

      Date of your first day of your last menstrual period:

      Ferility Window: