Miscarriage: Key Information, Causes, and Prevention

A miscarriage, also referred to as “spontaneous abortion,” is the loss of a fetus before the 20th week of pregnancy. Miscarriage is a common but often distressing experience, affecting about 15–25% of recognized pregnancies. While most miscarriages occur before 12 weeks (first trimester), some happen before a woman even realizes she is pregnant. A pregnancy loss after 20 weeks is considered a stillbirth.

Warning Signs and Symptoms

Miscarriage symptoms may vary, but common signs include:

  • Vaginal bleeding or spotting, ranging from light discharge to heavy bleeding
  • Cramping or abdominal pain
  • Lower back pain
  • Fluid or tissue passing from the vagina
  • Dizziness or feeling faint
  • Contractions

If you experience any of these symptoms, contact a healthcare provider immediately. In rare cases, an ectopic pregnancy—when the fertilized egg implants outside the uterus—can mimic miscarriage symptoms. An ectopic pregnancy requires urgent medical attention due to risks of internal bleeding.

Types of Miscarriage

  1. Threatened Miscarriage: Vaginal bleeding with back pain, but the cervix remains closed, and the pregnancy continues.
  2. Inevitable/Incomplete Miscarriage: Open cervix with bleeding and pain, indicating that miscarriage is inevitable or in progress.
  3. Complete Miscarriage: The uterus expels all pregnancy tissue, and symptoms subside quickly.
  4. Missed Miscarriage: The fetus has stopped developing, but there are no symptoms like pain or bleeding.
  5. Recurrent Miscarriage: Defined as two or more consecutive miscarriages during the first trimester.

Causes of Miscarriage

While many miscarriages occur due to genetic or developmental issues beyond anyone’s control, several factors can increase the risk:

  • Chromosomal Abnormalities: Incorrect chromosome numbers prevent normal fetal development.
  • Placental Issues: Poor development of the placenta affects blood flow to the fetus.
  • Womb or Cervix Issues: Conditions like fibroids or a weakened cervix can cause pregnancy loss.
  • Polycystic Ovary Syndrome (PCOS): Hormonal imbalances from PCOS can impact pregnancy.
  • Lifestyle Factors: Smoking, alcohol use, and recreational drug use increase the risk.
  • Health Conditions: Chronic conditions such as diabetes, hypertension, lupus, thyroid disease, or infections (e.g., HIV, malaria) can contribute to miscarriage.
  • Age: Miscarriage risk increases with age—1 in 5 pregnancies for women over 30 end in miscarriage, while the risk rises to 1 in 2 for women over 40.

Diagnosis and Treatment

Diagnosis:

  • Ultrasound: Confirms fetal heartbeat and development.
  • Blood Tests: Check levels of beta-human chorionic gonadotropin (hCG) and progesterone, essential for pregnancy.
  • Pelvic Exam: Assesses if the cervix is open or thinning, which may indicate miscarriage.

Treatment:
If the body does not expel all pregnancy tissue naturally, a healthcare provider may perform a dilation and curettage (D&C) to remove it. Medications may also be prescribed to prevent infection or manage bleeding. Emotional support is essential, as miscarriage can be a challenging experience.

Miscarriage Rates by Week

  • Weeks 3–4: Implantation issues can result in early losses, known as chemical pregnancies.
  • Weeks 5–6: Risk is about 21% at this stage.
  • Weeks 7–12: If the heartbeat is detected, the risk drops significantly to around 2–4%.
  • Weeks 13–20: Losses are rare, occurring in less than 0.5% of pregnancies. After 20 weeks, losses are classified as stillbirths.

Prevention Tips

Though not all miscarriages can be prevented, adopting healthy lifestyle habits can reduce risks:

  • Avoid smoking, alcohol, and recreational drugs.
  • Limit caffeine intake to less than 300 mg per day, as recommended by the World Health Organization (WHO).
  • Maintain a healthy weight before and during pregnancy.
  • Manage chronic health conditions like diabetes or hypertension.
  • Get vaccinated against infections such as rubella.
  • Consult with a doctor about medications that are safe during pregnancy.

Miscarriage Myths and Realities

Contrary to popular belief, activities like sex or light exercise do not cause miscarriage. However, certain types of intense physical activity might be inappropriate later in pregnancy. It is essential to consult a healthcare provider to determine safe activities.

Coping with Miscarriage and Future Pregnancies

Many people go on to have successful pregnancies after experiencing a miscarriage, and it is important to remember that a single miscarriage does not determine future fertility. The American College of Obstetricians and Gynecologists (ACOG) emphasizes that most individuals are able to conceive again relatively quickly, often within a few menstrual cycles, with no lasting complications. Studies suggest that the chances of a healthy pregnancy remain high even after one or two losses, with many couples successfully carrying pregnancies to term afterward.

In cases where multiple miscarriages occur—referred to as recurrent pregnancy loss (two or more consecutive miscarriages)—it may indicate underlying medical or genetic issues. Genetic testing, hormonal evaluations, and assessments of uterine health can provide insights into potential causes. In some situations, conditions such as a weakened cervix, polycystic ovary syndrome (PCOS), or autoimmune disorders like lupus can contribute to pregnancy loss, and targeted treatments may be recommended to support future pregnancies. Mental health care is also essential during this time, as dealing with repeated losses can lead to emotional distress.

Even with these challenges, advances in reproductive medicine—such as fertility treatments, progesterone supplements, and in-vitro fertilization (IVF)—have given individuals with a history of miscarriage new opportunities for parenthood. Many healthcare providers encourage couples to seek emotional and physical recovery before trying again and remind them that a history of miscarriage does not eliminate the possibility of welcoming a healthy baby into their lives.

Couple after hearing bad news

Summary

Miscarriage is a common but deeply personal experience. Although it can be caused by various factors, many are beyond one’s control. Staying healthy, seeking medical support, and leaning on family and friends can help individuals cope with the loss and prepare for future pregnancies. While miscarriage rates decline as pregnancies progress, no two experiences are alike. Emotional healing is as important as physical recovery, and with proper care, most people can have healthy pregnancies after a loss.

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