Is one-sided abdominal pain during pregnancy dangerous?
Should you be concerned about light spotting after a positive pregnancy test?
Why is an "ectopic pregnancy" considered a medical emergency?

An ectopic pregnancy is a condition where a fertilized egg implants outside the main cavity of the uterus, making it impossible to grow normally. If not diagnosed early, it can lead to severe internal bleeding and can be life-threatening.

Although less common than a normal pregnancy, it is a critical condition that requires close attention, especially during the early stages of pregnancy.

What is an ectopic pregnancy?

Normally, a fertilized egg implants inside the uterus.
However, in an ectopic pregnancy, the egg implants elsewhere, such as:

• The fallopian tube (the most common site)

• The ovary

• The cervix

• The abdominal cavity

These areas are not designed to expand to support a growing pregnancy, which leads to a risk of rupture and severe bleeding.

According to guidelines from the American College of Obstetricians and Gynecologists, an early diagnosis significantly reduces the risk of severe complications.

6 Warning Signs of an Ectopic Pregnancy

1️⃣ One-sided abdominal pain

The most prominent symptom is lower abdominal pain localized on one side.
It can range from a dull ache to sharp, sudden pain.

2️⃣ Abnormal vaginal bleeding

The bleeding is often light or spotting, and typically dark red or brown in color.
Many people mistake this for a normal menstrual period.

3️⃣ Dizziness and lightheadedness

If there is significant internal bleeding, blood pressure can drop rapidly,
causing dizziness, heart palpitations, or fainting.

4️⃣ Shoulder pain

In some cases, blood pooling in the abdomen can irritate the diaphragm, causing referred pain that is felt in the shoulder.

5️⃣ A positive pregnancy test but no pregnancy sac visible on ultrasound

If an ultrasound does not show a gestational sac inside the uterus despite a positive test, an ectopic pregnancy is highly suspected.

6️⃣ Suboptimal rise in hCG levels

Doctors may monitor hCG hormone levels. If they rise slower than expected, it may indicate a pregnancy in an abnormal location.

Why is an ectopic pregnancy so dangerous?

Because if a fallopian tube ruptures, it can cause rapid, life-threatening internal bleeding, which is a medical emergency requiring immediate surgery.

In the past, ectopic pregnancies were a leading cause of maternal mortality in the first trimester.
Although diagnostic tools have improved greatly, the risks remain high.

Information from the World Health Organization emphasizes that timely access to diagnosis and treatment plays a crucial role in reducing maternal mortality rates.

Who is at higher risk?

• Those who have had a previous ectopic pregnancy

• Those with a history of fallopian tube surgery

• Those with a history of pelvic inflammatory disease (PID)

• Those who have used certain assisted reproductive technologies

However, it is important to note that ectopic pregnancies can still occur in individuals with no known risk factors.

How is it diagnosed?

The evaluation typically includes:

• A transvaginal ultrasound

• An hCG hormone level test

• A clinical symptom assessment

How is it treated?

Treatment depends on how early the condition is detected and its severity:

• In early cases, medication such as methotrexate may be used to stop cell growth and dissolve the pregnancy.

• If rupture or heavy bleeding has occurred, emergency surgery is necessary.

Early treatment helps preserve the fallopian tubes and reduces the risk of complications.

When should you go to the emergency room immediately?

• Sudden, severe abdominal pain

• Dizziness, lightheadedness, or fainting

• Shoulder pain accompanied by vaginal bleeding

• Rapid heartbeat or cold sweats

Do not wait to see if symptoms improve on their own.

In Summary

An ectopic pregnancy is a condition where the embryo implants outside the uterus.
It may start with mild symptoms but can quickly become life-threatening.

If you have a positive pregnancy test, it is highly recommended to get an ultrasound to confirm that the pregnancy is safely located inside the uterus. 

An early diagnosis not only confirms the location of the pregnancy but also allows doctors to assess risks, plan appropriate care, and prevent potentially dangerous complications.

Early detection is the key to preventing serious complications and ensuring the safety of the mother.

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Cared for by OB-GYN specialists with advanced ultrasound technology for clear imaging and detailed pregnancy assessments.
Our clinic offers a warm, private, and unhurried atmosphere.
Conveniently located at Ari Soi 2, just 200 meters from Ari BTS Station, with parking available.

Author

Dr. Wichadet Wichulada
Obstetrician-Gynecologist specializing in Maternal-Fetal Medicine
Chulalongkorn Hospital

Research published in the International Journal of Transgender Health

References

1. American College of Obstetricians and Gynecologists. Ectopic Pregnancy Guidelines.

2. World Health Organization. Maternal health recommendations.

3. Williams Obstetrics, 26th Edition.