Blocked uterine tube - another common cause of infertility. You may be ovulating normally and everything else checks out all right. However, a blockage in one or both of your uterine tubes can prevent sperm from reaching the egg.

Hormonal imbalances - Any sort of hormonal imbalance can affect your fertility. Most often, it will cause annovulation, or the lack of ovulation. Sometimes it can affect the lining of your uterus and prevent a fertilised egg from implanting.

Polycystic Ovarian Syndrome (PCOS) - With PCOS, your body has high levels of testosterone, oestrogen and Luteinising Hormone. This hormonal imbalance causes irregular cycles and ovulation stops.

Endometriosis - Endometriosis is the presence and growth of endometrial tissue in places other than the uterus. One of the more common places for this tissue to grow is on the ovaries. It can cause damage, which may result in infertility.

Other - You may experience problems as a result of disease, cancer, sexually-transmitted diseases or abortion.

Sperm disorders: The sperm can be abnormally shaped, unable to move properly, or too few in number. Infectious diseases, such as mumps, or an inadequate production of certain sex hormones can lead to a low sperm count

Poor egg quality

If your eggs are damaged or have chromosomal abnormalities, they can't sustain a pregnancy. The quality of your eggs declines significantly with age.