Most first-trimester miscarriages are caused by chance chromosomal errors that happen when the embryo is first forming. (Chromosomes are parts of a cell that carry a person's genes.) This is usually a one-time event that does not repeat itself in a woman's next pregnancy. 2 Many miscarriages have no known cause.
After the first 12 weeks of pregnancy, or when the fetal heartbeat is seen on ultrasound, miscarriage risk drops significantly. 3
Risk factors that may increase chances of a miscarriage include:
Increasing age, especially at age 35 and older.
A history of two or more miscarriages. 4
Nonsteroidal anti-inflammatory drug (NSAID) use (such as ibuprofen or naproxen) at the time of conception or during early pregnancy. 5
Alcohol or drug use during pregnancy.
Cigarette smoking during pregnancy.
Exposure to dangerous chemicals, such as benzene, arsenic, or formaldehyde, before or during pregnancy.
Heavy caffeine use during pregnancy.
Certain gynecological problems, such as uterine fibroids or other abnormalities of the uterus.
Disease or infection during pregnancy, including an autoimmune disease.
Physical trauma.
An immunologic cause—a woman's immune system rejects the pregnancy—which is a factor in a small number of miscarriages.
Recent research suggests that low folic acid levels may also increase the risk of miscarriage. 6
2007-01-02 20:45:36
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answer #1
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answered by phattygirl 3
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A number of problems can cause a miscarriage. The most common, by far, is a chromosomal abnormality where the genetic material from the sperm and egg do not fuse together appropriately. This accounts for about one-half of all miscarriages and is most commonly a random event that is, essentially, very bad luck. A variation of this is when a "blighted ovum" occurs, where the water bag and placenta (afterbirth) develop but not the fetus (baby). Fortunately, in about 9 out of 10 cases, the next pregnancy after these types of miscarriages will be normal!
An abnormality of the uterus (womb) may cause about 15% of recurrent miscarriages. In this situation the uterine muscle is slightly malformed and the pregnancy cannot grow appropriately. This problem is diagnosed with a special x-ray or ultrasound of the uterus and surgery is usually successful in curing the problem.
Some unusual vaginal infections can cause recurrent miscarriages, although it appears that this is not common. Cultures of the vagina and antibiotics are sometimes helpful if your doctor suspects an infection.
Rarely (about 3% of the time), a chromosomal problem of one or both partners can lead to recurrent pregnancy loss. This problem, usually a "balanced translocation," is diagnosed by taking a blood or tissue sample from each partner and performing a 'karyotype' to check the chromosomes. There is a higher rate of miscarriages in patients who have such a chromosomal problem, although many go on to deliver normal and healthy babies.
Autoimmune problems, where certain chemicals in the blood stream attack cells and tissues within the body, can lead to recurrent pregnancy loss. These chemicals, called 'antibodies,' circulate in the blood stream and may not ever cause problems, or they may lead to disorders such as diabetes, lupus, antiphospholipid syndrome, or hypothyroidism. They can also lead to blood clots in the placenta, which shuts off the blood supply to the developing fetus, causing a miscarriage. Special blood tests can diagnose this problem, and treatment with low-dose aspirin and sometimes a 'blood thinner' called heparin will usually lead to a successful pregnancy. These are "high-risk" pregnancies because of an increased chance of small babies, fetal stress, preeclampsia ('toxemia', where the blood pressure rises dangerously during pregnancy), and other problems.
During pregnancy a benign cyst on the ovary, called the corpus luteum, produces the hormone progesterone which is necessary for maintaining the pregnancy during the first trimester. Although somewhat controversial, some doctors feel a "luteal phase defect" can cause recurrent pregnancy loss. This condition may occur when not enough progesterone is present to act on the lining of the uterus. Diagnosis is made when 1 (and often 2) endometrial biopsies are performed by taking a sample of tissue from the uterine lining, and treatment is usually with either progesterone supplements, or a medication called clomiphene citrate.
Finally, a very controversial potential cause of recurrent miscarriages is an allo-immune disorder, where the man and woman have too much genetic material in common. The theory is that the mother's body 'rejects' the fetus in a way similar to how a transplant patient might reject a new organ. Some doctors advocate extensive (and expensive) testing to diagnose this condition, and use injections of the male partner's white blood cells into the female partner's blood stream to help prevent future miscarriages. Many doctors disagree with this testing and treatment, saying that research is lacking to prove that it is helpful Many feel that doctors should not attempt such expensive testing and treatment until further research proves that this therapy is helpful.
2007-01-02 20:47:57
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answer #2
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answered by GreyRainbow 4
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Oh goodness there could be many reasons, poor diet and nutrition, low hormonal levels, genetic abnormalities, etc. But the woman is not at fault, pregnancy is a very complex thing, the body goes thru ALOT of changes for a baby. What involves a miscarriage is heavy cramping, bleeding, passing blood clots, lightheadedness, vomiting, fainting, but usually the really heavy bleeding and cramping.
2007-01-02 21:40:25
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answer #3
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answered by MadameJazzy 4
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I have had a miscarriage bfore, it devasted me. I was 14 weeks pregnant, and it happened just after my house was broken into whe I was asleep one night. My family said its natures way of saying there is something wrong with the baby. But I always thought that, as it happened 2 days after my house getting broken into, it was the stress of what happened. Its a good question. Just a shame that no one can really answer it as it would save so many women from such devastating heart ache.
2007-01-02 20:45:44
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answer #4
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answered by niki d 2
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no of reasons, usually down to a problem with the fetus. It is actually quite difficult for a woman to cause a miscarriage by anything she herself does. If its gonna happen there really isn't anything u can do to stop it. Sad but true.
Tiffi - have a little sensitivity here please, we are talking about a very sensitive subject and i do not appreciate your sick childish and cruel remarks. Lets hope u never lose a baby, eh
2007-01-02 20:39:51
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answer #5
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answered by Serry's mum 5
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Her body may just reject the pregnancy for no apparent reason at all. The body knows when something isn't right. It's much more common than people realize. I'm sure there must be some sites to read up on miscarriage.
2007-01-02 20:38:38
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answer #6
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answered by uknowme 6
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The cause isn't always known. But some are suspected to be related to abnormalities in the fetus, uterus, etc.
2007-01-02 20:38:10
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answer #7
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answered by Anonymous
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when damion tries to crawl out or your wife's name is Rosemary, it's always a bad, bad sign.
2007-01-02 20:39:07
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answer #8
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answered by Tiffi Poodle Pie 69 2
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