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my girlfriend had a misscarege what could have caused this

It may be difficult for health care providers to know what caused a particular miscarriage. But we do know some things that make miscarriage more likely in general:

  • The embryo or fetus has a chromosome that causes it to develop abnormally. This is not usually a sign of a condition that could cause problems in future pregnancies. It usually happens by chance when the fertilized egg divides and grows. This problem causes at least half of miscarriages.
  • Severe chronic illness — such as poorly controlled diabetes, rheumatoid arthritis, or lupus — can cause miscarriage.
  • Severe trauma and very serious infections also can cause miscarriage.
  • Abnormalities in the uterus, like scar tissue or uterine fibroids, can cause late miscarriages — after three months.
  • Smoking, the use of alcohol or cocaine, and heavy caffeine use have all been tied to miscarriage.
  • A woman’s risk of miscarriage increases as she ages.
  • Many of us who experience miscarriage are not aware that it is fairly common. For every 10 pregnancies, one to two end in miscarriage. Miscarriage is most likely to happen early in pregnancy — in fact, eight out of 10 miscarriages happen in the first three months of pregnancy.

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