Is It Common To Get Cold Sores (Fever Blisters) During Pregnancy?

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Cold sores or fever blisters erupt inside the lips or cheeks, around the mouth, or near the nose and chin. These itchy and tingly sores might sometimes be painful too. Usually, cold sores are likely to disappear in a couple of weeks. But what happens when they occur during pregnancy? What should you do about them?

We tell you about it in this MomJunction post. Keep reading to know more about cold sores during pregnancy.

Are Cold Sores Common In Pregnancy?

Cold sores are usually caused by herpes simplex virus (HSV), especially type 1 of the virus (1). Therefore, they are likely to be common in women who have experienced them in the past (2).

What Are The Causes Of Cold Sores During Pregnancy?

Citrus fruits can trigger the virus and cause cold sores

Image: iStock

Cold sores are caused by the herpes simplex viruses named HSV1 and HSV2. The virus transmits from one person to another through skin to skin contact during touching, sexual intimacy, kissing, or sharing contaminated items (3).

Once a woman has contracted the virus, the following risk factors could trigger the cold sore virus.

  • Hormonal changes that frequently rise and fall could make the body susceptible to viral infection, including a cold sore outbreak (4).
  • Psychological concerns, such as stress and fear could trigger the virus (5).
  • Certain foods (acidic, spicy, or salty), citrus fruits, exposure to the sun, and hot water could trigger the virus and cause cold sores (6).

Signs And Symptoms Of Cold Sores In Pregnancy

Cold sores during pregnancy may cause fever and sore throat

Image: Shutterstock

The common signs and symptoms that could indicate cold sores during pregnancy include:

  • Swelling of the lips
  • Small, painful blisters
  • Redness
  • Tiny bumps over your lips
  • Fever
  • Pains and aches
  • Sore throat

Cold sores develop gradually, in five different stages, when you might experience the above symptoms. Understanding the changes in each of these stages might help you take the right steps to prevent them from spreading to other parts of the body.

Stages Of Cold Sores

The cold sores last for seven to 12 days, and during this time, they might progress in different stages (7).

Stage 1: The tingling stage

You may experience a tingling sensation for about a couple of days. The skin (inside your lips, on your lips, or inside the cheeks) might turn sore and red and might even swell and become itchy.

Stage 2: The blister stage

This stage lasts for about two days. During this stage, new blisters may form and spread to other parts in the absence of proper care.

Stage 3: The weeping stage

At this stage, the blisters may burst, and you might experience pain. The cold sores might scab over at this point.

Stage 4: The scabbing stage

The scabs may crack and even bleed. They could be itchy, but make sure you are not poking them.

Stage 5: The healing stage

In this stage, all the scabs flake off and disappear soon after. Even the scars slowly vanish.
Observe the progress of cold sores and treat them in time to prevent the infection from spreading.

Are Cold Sores Contagious?

The active Herpes virus can spread through lipsticks or cups

Image: Shutterstock

According to the World Health Organization (WHO), herpes infections are highly contagious when symptoms such as ‘cold sores’ are present (8). The virus may be passed from one person to another. If the bump ruptures, the active virus could spread via lipstick, cups, utensils, kissing, or through oral sex (9).

According to the UT Southwestern Medical Center, HSV 1 or the cold sore infection could pass from the infected person to the baby. This usually happens when the person kisses the baby or when the baby is touched after the cold sore is touched (10).

Therefore, it is important to treat the cold sore in pregnancy to prevent the virus from spreading to the baby after it is born. Herpes infection is mild for the mother but can be life-threatening for the baby.

Point to consider
Pregnant women contracting herpes infection for the first time (primary infection) have a higher infection transmission rate. A newly infected mother doesn’t have the antibodies to provide natural protection to the baby (2).

How To Treat Cold Sores In Pregnancy?

Home care measures for the sores might alleviate pain and discomfort. In some cases, medication may be necessary.

1. Home treatment

A mouthwash containing baking soda may reduce the soreness

Image: iStock

  • You may try some home remedies to ease the cold sore-related pain and discomfort
  • Placing a cold compress (wet, cool cloth, or towel) on the sores may help reduce the redness and pain.
  • A mouthwash containing baking soda may also reduce the soreness.
  • Apply sunscreen before going outside.

You may apply aloe vera gel or lip balm containing soothing ingredients on the sores.

2. Clinical medicine

Before you take any medication for cold sores in pregnancy, talk to your doctor. Ideally, antiviral medications are prescribed to treat cold sores. According to the American Academy of Family Physicians, the common options include valacyclovir, famciclovir, and acyclovir (11). These fall under pregnancy category B medications of the US Food and Drug Administration.
If the cold sores get severe, the doctor may change the dose or prescribe other treatment.

Are Cold Sores An Early Sign Of Pregnancy?

Cold sores are common, and most pregnant women may experience them. But they may not be an early sign of pregnancy. A woman may get cold sores at any point during the gestation period.

Are Cold Sores During Pregnancy Harmful To The Baby?

According to the Royal Hospital for Women, Australia, cold sores may not affect newborn babies. But they are infectious and should be treated in time, so they don’t spread to the infant (1). However, if you have genital herpes, then there are chances of the virus transmitting to the baby during the process of childbirth (known as acquired herpes). This can be very dangerous for the baby. Hence, a cesarean section is indicated to avoid contact of the baby with the cold sores.

Did you know?
Neonatal herpes infection may result in viral meningitis. However, it occurs in less than 1% of births, and the development of meningitis from HSV-1 infection is quite rare (10).

Frequently Asked Questions

1. Can pregnancy flare-up cold sores?

Pregnancy modulates the immune system, and women who have herpes may have an increased risk of outbreaks of cold sores during pregnancy (12) (13).

2. Can pregnancy hormones cause cold sores?

Cold sores may be triggered due to hormonal changes during pregnancy or menstruation in women already exposed to the herpes simplex virus type 1 (HSV-1) (14).

3. Can I use Abreva for cold sores while pregnant?

The manufacturer’s instruction states that Abreva is not recommended for treating cold sores in pregnant or lactating women unless advised by a doctor (15).

4. Can I use cold sores cream when pregnant?

A doctor may prescribe cold sores creams containing aciclovir, an antiviral medication, for treating cold sores during pregnancy (2).

HSV1 and HSV2 can produce cold sores during pregnancy that can emerge inside the lips or cheeks, near the nose and chin, or around the mouth. The advancement and healing may occur in stages over seven to twelve days. It is advised to avoid touching the sores when they erupt, follow a well-balanced diet, and get plenty of rest to avoid cold sores during pregnancy. Also, stay away from spicy meals and wash your hands frequently. Though cold sores are not a cause for concern during pregnancy, you should visit your doctor and have them treated as soon as possible.

Infographic: Precautions For Cold Sores When Pregnant And Postpartum

For most women who have experienced cold sores before, developing them while pregnant or after having a baby is not uncommon. If you are concerned that cold sores could impact your pregnancy or baby, the safety tips in this infographic could ease your worry and help you prevent them while pregnant, and protect your newborn from acquiring the infection.

cold sores during and after pregnancy [infographic]
Illustration: MomJunction Design Team

Key Pointers

  • Cold sores are blisters inside the mouth or near the nose, caused by the herpes simplex virus and commonly seen in women with past exposure.
  • The virus is contagious, and factors such as hormonal or psychological changes can trigger its occurrence in pregnant women.
  • It is not an alarming concern. You may try some effective home remedies or consult your ob/gyn for pregnancy-safe medications.


MomJunction's articles are written after analyzing the research works of expert authors and institutions. Our references consist of resources established by authorities in their respective fields. You can learn more about the authenticity of the information we present in our editorial policy.
1. Cold sores (herpes simplex type 1) – including symptoms, treatment and prevention; Government Of South Australia (2019)
2. Cold sores in Pregnancy and Breastfeeding; The Royal Hospital For Women (2016)
3. Cold sores in pregnancy; Pregnancy, Birth and Baby; Healthdirect Australia (2019
4. Cold sores; University of Wisconsin-Madison
5. D. B. Donahue; Diagnosis and Treatment of Herpes Simplex Infection During Pregnancy; Journal of Obstetric, Gynecologic & Neonatal Nursing (2002)
6. Herpes simplex; Mount Sinai
7. Cold Sores; San Diego State University
8. Herpes simplex virus; World Health Organization (2017)
9. D. Shipp; How contagious are cold sores?; The Ohio State University (2019)
10. R. Horsager-Boehrer and J. Kahn; How to protect your baby from herpes infection; UT Southwestern Medical Center (2017)
11. ACOG Releases Guidelines on Managing Herpes in Pregnancy; American Academy of Family Physician (2008)
12. Gil Mor and Ingrid Cardenas; The Immune System in Pregnancy: A Unique Complexity; American Journal of Reproductive Immunology (2010)
13. Cold sores in pregnancy; Pregnancy Birth & Baby
14. Cold Sores; Cleveland Clinic
15. Understanding cold sores; Abreva Canada

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