There is seldom an adequate explanation for why a woman experiences a miscarriage Studies inform us that approximately 50 per cent of lost pregnancies have failed to develop normally, either due to chromosome or genetic problems or because of structural (bodily) problems. There is no apparent explanation for the remaining 50 per cent of cases.

• Certain maternal illnesses are associated with an increased risk of miscarriage, although these are very uncommon.
• Smoking increases the risk of miscarriage.
• There is a gradual increase in the risk of miscarriage as the woman gets older.

It is important to remember that an ordinary lifestyle that includes exercise, going to work, minor falls or taking the Pill before pregnancy does not increase the risk of miscarriage.