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Miscarriage: Causes and Symptoms

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As many as 40 percent of all pregnancies may end in miscarriage, often before a woman even realizes that she’s pregnant. A miscarriage is a pregnancy loss that occurs before the 20th week of pregnancy.

Most miscarriages occur in the first trimester (prior to 13 weeks). Of the 1 percent to 5 percent of pregnancies that result in miscarriage in the second trimester (between 13-19 weeks), these losses are oftentimes related to problems with the uterus or a weakened cervix that prematurely dilates.

The causes of first-trimester miscarriage are not thoroughly understood. Most often, miscarriages occur when a pregnancy is not developing normally. Some of the most common reasons for miscarriage include a chromosomal abnormality in the fetus, a blighted ovum, certain maternal health conditions and certain lifestyle or environmental factors.

More than 50 percent of first-trimester miscarriages are caused by a chromosomal problem in the fetus. Each person has 23 pairs of chromosomes, which are thread-like structures, in each cell.

If an embryo has the wrong number of chromosomes, the pregnancy usually results in an early miscarriage. A blighted ovum, when a pregnancy sac contains no fetus, is also often attributed to chromosomal abnormalities that either prevented the embryo from forming or halted embryo development.

Miscarriages are less likely for women who receive early, comprehensive prenatal care and avoid environmental hazards (such as X-rays, drugs and alcohol, high levels of caffeine, and infectious diseases).

Although certain maternal health conditions such as thyroid disease, infections, exposure to environmental toxins, certain hormonal problems, bloodclotting disorders and autoimmune disorders can increase the risk of miscarriage, treating these conditions before and during pregnancy can reduce the risk and/or prevent miscarriage. Women who smoke and/or use illicit drugs may increase their risk of miscarriage.

Vaginal bleeding, menstrual-like cramps or abdominal pain are signs that a miscarriage may occur. While many women experience spotting (light vaginal bleeding) in early pregnancy, most do not miscarry. Nonetheless, a woman should contact her health care provider if she experiences any bleeding, even light spotting, or abdominal pain in pregnancy.

Most women who have an early miscarriage do not require treatment. Rather, the uterus empties itself via a heavy period. If, however, an ultrasound shows that there is tissue remaining in the uterus or if the woman’s bleeding is particularly heavily, the provider may recommend treatment to empty the uterus.

This can be done via a surgical procedure called a dilation and curettage (D and C). During a D and C, the cervix is dilated and the tissue is removed with suction or with an instrument called a curette.

Since waiting for a miscarriage to occur can be distressing, health care providers often offer a D and C to women with a blighted ovum or a missed miscarriage (ultrasound shows the embryo has died, but a miscarriage has not yet happened) in order to empty the uterus. A woman and her health care provider choose the approach that is best for her.

Even if the cause of their repeated miscarriages cannot be found, couples should stay encouraged. Even without treatment, approximately 60 percent to 70 percent of women who experience repeated miscarriages have a successful subsequent pregnancy.

Although (depending upon the length of the pregnancy) it may only take weeks or months for a woman to recover physically, it may take much longer to recover emotionally. Women and their partners often experience intense grief as they mourn this loss.

Since a woman and her partner may handle their grief in different ways, they should not hesitate to ask their health care provider for a referral to a counselor who is experienced with dealing with pregnancy loss or a pregnancy loss support group.


Miscarriage. Web. Marchofdimes.com. Accessed 23 Oct. 2011

Miscarriage. Web. Ncbi.nlm.nih.gov. Accessed 16 Oct. 2011

Miscarriage Causes. Web. Mayoclinic.com. Accessed 23 Oct. 2011

Reviewed October 24, 2011
by Michele Blacksberg RN
Edited by Jody Smith

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We value and respect our HERWriters' experiences, but everyone is different. Many of our writers are speaking from personal experience, and what's worked for them may not work for you. Their articles are not a substitute for medical advice, although we hope you can gain knowledge from their insight.



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