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Causes of Abdominal Pain & Light Bleeding During Pregnancy

author image Sharon Perkins
A registered nurse with more than 25 years of experience in oncology, labor/delivery, neonatal intensive care, infertility and ophthalmology, Sharon Perkins has also coauthored and edited numerous health books for the Wiley "Dummies" series. Perkins also has extensive experience working in home health with medically fragile pediatric patients.
Causes of Abdominal Pain & Light Bleeding During Pregnancy
A pregnant woman talking with her doctor. Photo Credit: monkeybusinessimages/iStock/Getty Images

Abdominal pain and light bleeding occur frequently in pregnancy. As many as 20 to 30 percent of women bleed in early pregnancy, the American Pregnancy Association states. The significance of these symptoms can range from normal and harmless to life-threatening, depending on the time during the pregnancy when symptoms appear, the severity, duration and the cause. Any episode of abdominal pain or cramping along with bleeding or spotting requires medical evaluation in pregnancy.

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Time Frame

Timing of abdominal pain and light bleeding during pregnancy can help determine the cause. These symptoms can occur during normal pregnancy within the first 6 weeks, when bleeding and mild cramping can indicate implantation of the embryo. However, bleeding and cramping can also occur as the first signs of miscarriage or ectopic pregnancy in the first 12 weeks of pregnancy.

Abdominal cramping and bleeding are never normal during the third through eighth month of pregnancy, although some women experience mild cramping and possibly light bleeding if they have cervical irritation after having sex. Bleeding and pain can occur with preterm labor or severe complications such as placenta previa, where the placenta implants abnormally low on the uterine wall or placental abruption, where the placenta detaches prematurely. In the last month of pregnancy, abdominal pain and light bleeding can herald the beginning of labor.


Bleeding and cramping from miscarriage start mildly and progress, while implantation bleeding usually lasts only a day or so. Ectopic pregnancy causes severe abdominal pain, while bleeding may be scant, as blood collects in the abdominal cavity. Bleeding with placenta previa is painless but bleeding may become heavy, while placental abruption, which affects one in 100 pregnancies, mostly during the third trimester, according to the March of Dimes, causes severe abdominal pain and variable bleeding, since much of the blood may accumulate in the uterus. Preterm labor can cause mild or severe abdominal pain and scant bleeding. Bleeding and abdominal pain in labor start out mild but progress as labor intensifies, although bleeding should never become heavy.


Even mild bleeding or abdominal pain can signify serious complications in pregnancy. The degree of bleeding or pain doesn’t indicate the severity of the problem, which is why any bleeding and pain should be checked by a doctor.

Benefits of Early Diagnosis

Most miscarriages can’t be prevented and early diagnosis doesn’t reduce the risk of pregnancy loss, since most miscarriages are caused by fetal chromosomal abnormalities. Ectopic pregnancy does benefit from early treatment, since tubal rupture can cause life-threatening hemorrhage. If diagnosed early, ectopic pregnancy can be treated with medication rather than surgery. Placental problems and preterm labor always benefit from early diagnosis; while in most cases these complications can’t be avoided, they can be medically managed to minimize maternal and fetal complications.


Preterm labor, placental abruption and placenta previa can all lead to early delivery and possible maternal or fetal death or long-term health problems. While ectopic pregnancy always ends with fetal loss, the fallopian tube may not need surgical removal if medication is given early enough. Maternal hemorrhage can also be avoided. Miscarriage can rarely be prevented, but complications such as infection or hemorrhage may be avoided.

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