Miscarriage is common, but finding its cause may not be easy. If a cause can be found, it’s likely to be a problem with the baby or the uterus or cervix. Other factors cause miscarriage, but they're less common.
Problems with the baby
Either of these problems with the baby can cause a miscarriage:
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A problem with the baby’s chromosomes
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Birth defects
Problems with the uterus or cervix
Any of these problems with the uterus or cervix can cause a miscarriage:
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The uterus may be divided (have a septum). Or it may have growths, such as fibroids or adhesions.
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The lining of the uterus may be too thin for the fertilized egg to grow in.
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The cervix may be too weak to support the weight of a growing baby.
Other factors
Any of these problems can cause a miscarriage:
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Advanced maternal age (35 years or older)
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Having a previous miscarriage
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A serious maternal illness, such as uncontrolled diabetes, high blood pressure, or kidney disease
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A bad injury, such as from a car accident
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Contact with toxins or radiation
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Infections, such as syphilis
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Exposure to arsenic or lead
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Obesity
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Lifestyle factors including:
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Drinking alcohol
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Smoking cigarettes or using other tobacco, nicotine, or vaping products
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What does not cause miscarriage?
A lot of myths and old wives’ tales try to explain the cause of miscarriage. But they aren't true. None of these causes miscarriage:
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