It's often not clear why a miscarriage occurs, but in many cases it is believed that a fetus is aborted because it is not developing normally. This is thought to be a chance event and is usually not due to a defect in either parent. Several factors can contribute to abnormal fetal development, including:
abnormalities in the father's sperm or in the mother's egg
disease in the mother, such as rubella (German measles), severe heart or kidney disease, diabetes, or thyroid disease
abnormalities in the uterus
the mother's use of certain drugs
the mother's exposure to toxic substances or certain environmental pollutants(That's interesting, if not making me a little paranoid and obsessive as they're ie toxins everywhere from the air that you breath to the water you drink).
Although women often worry that severe emotional trauma or stress or simply falling can cause a miscarriage, this is rarely--if ever--the case. That's true for automobile accidents, too.
The symptoms of a miscarriage are vaginal bleeding (from a few drops to a heavy flow) and uterine cramps (either dull and constant or sharp and intermittent) in the lower abdomen or back. The bleeding can start suddenly or follow a brownish discharge. A solid clot of material or tissue may pass from the vagina. If possible, this should be saved for the doctor, who may be able to examine it and confirm that a miscarriage has occurred. A miscarriage can either be complete, when the uterus expels all the tissue, or incomplete, when some tissue remains inside the uterus.
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