Miscarriage is caused by the separation of the fetus and placenta from the uterine wall. Although the actual cause of the miscarriage is frequently unclear, the most common reasons include the following:
- An abnormal fetus causes almost all miscarriages during the first three months of pregnancy (first trimester). Problems in the genes are responsible for an abnormal fetus and are found in more than half of miscarried fetuses. The risk of defective genes increases with the woman's age, especially over if she is older than 35 years.
- Chronic illnesses, including diabetes, severe high blood pressure, kidney disease, lupus, and underactive or overactive thyroid gland, are frequent causes of a miscarriage. Prenatal care is important because it screens for some of these diseases.
- Acute infections, including German measles, CMV (cytomegalovirus), mycoplasma ("walking" pneumonia) and other unusual germs, and severe emotional shock, can also cause miscarriage.
- Diseases and abnormalities of the internal female organs can also cause miscarriage. Some examples are an abnormal womb, fibroids, poor muscle tone in the mouth of the womb, abnormal growth of the placenta (also called the afterbirth), and multiple gestations that place a stress on your system.
- Other factors, especially certain drugs, including caffeine, alcohol, tobacco, and cocaine, may be related to miscarriage.
http://our-medical-center.blogspot.com/2008/01/miscarriage-causes.html
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