Miscarriage

Immune system
Problems with the mother accepting the pregnancy can lead to miscarriage.

Infections
Minor infections like colds are not harmful, but a very high temperature and some specific illnesses of infections, such as German measles, may cause miscarriage. Some researchers have found that high levels of the bacteria in the vagina (bacterial vaginosis See Gynaesurgeon.co.uk - Vaginal discharge) can also increase the risk of miscarriage.

Womb problems
If the cervix (neck of the womb) is weak, it may start to open as the uterus (womb) becomes heavier in later pregnancy and this may lead to miscarriage. Large fibroids may cause miscarriage in later pregnancy. An irregular-shaped uterus can mean that there is not enough room for the baby to grow in later pregnancy.

Some pregnancies are lost through ectopic pregnancy. This is when the fertilised egg implants outside the cavity of the womb, most commonly in one of the Fallopian tubes (see 'Early pregnancy assessment')

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