- Disorders of ovulation, or no periods at all (ovulation refers to the monthly release of an egg) (20%)
- Damage to, or blockage of the fallopian tubes and/or Endometriosis – (endometriosis is a common condition where tissue, like the lining of the womb, is found outside of the womb, this tissue can cause fertility problems) (20%)
- Anatomical abnormalities of the uterus or cervix (5%)
- Abnormal sperm counts may be due to problems affecting the numbers and/or the quality of sperm produced
- There may be blockages preventing the sperm being released in to the ejaculate
- There are a number of conditions in which sperm production may not be taking place.
The good news is that many of the causes of infertility can be treated successfully.
In about a quarter of couples (25%), no identifiable cause is found. This is called unexplained infertility.