Is It Normal To Have A High Heart Rate When You Are Pregnant?
Increased heart rate reaching up to 100 bpm (beats per minute) and above could be normal for most people. During pregnancy, the heart rate might increase by 25% (1), which is considered to be a fast heartbeat that might result in episodic heart palpitations during pregnancy.
The condition is referred to as tachycardia and might be a common or uncommon occurrence during pregnancy (2). With a fast heartbeat, you might feel like your heart is pounding, fluttering, or racing. Your body is nourishing another life within and requires more oxygen and nutrients, thereby making your heart work harder to pump in more blood for it.
However, other factors, such as an underlying medical condition, could also lead to a faster heartbeat during pregnancy. That is why it is important to understand the causes of high heart rate during pregnancy.
Read this MomJunction post to understand fast heartbeat during pregnancy and ways to find relief from it.
Causes Of High Heart Rate During Pregnancy
In addition to the physiological factors, several other possible aspects can cause a rapid heartbeat. Some of them include:
- Changes in heart and blood flow: Your uterus requires more blood to supply enough oxygen and nutrients for the baby’s growth and development. As a result, your heart pumps around 30 to 50% more blood than usual (3). Therefore, the normal heartbeat, which is 60bpm to 80bpm, increases by 10bpm to 20bpm throughout pregnancy, and reaches the maximum around the third trimester (4).
- Anxiety: It is normal to worry about your baby and your safety during delivery, and about the overall responsibility of carrying another life. Anxiety might cause an increased heartbeat (5).
- Changes in the uterus size: The uterus increases in size to hold the growing fetus, and requires more blood supply for it (6). This leads to the heart working or beating more than usual to pump the extra blood to the uterus.
- Changing breasts: The mammary glands start to function while you are still pregnant and prepare the body for breastfeeding. As the breasts expand and the tissues enlarge, the mammary blood flow also increases, which means the heart has to pump more blood than usual (7).
- Medical conditions: Thyroid disorders (8), anemia (9), preeclampsia (10), and heart issues such as coronary heart disease and pulmonary hypertension could also stimulate heartbeat during pregnancy (11).
- Other pregnancy effects: Weight gain, hormonal changes, and side effects of pregnancy medications may exert strain on the circulatory system, causing increased heart rate.
- Lifestyle factors: Cigarette smoking, alcohol abuse, exercise, and over-consumption of caffeine might also increase the heart rate.
Symptoms Of Fast Heartbeat In Pregnant Women
A fast heartbeat during pregnancy is accompanied by many other symptoms including (1)–
- Shortness of breath
- Skipped heartbeats or palpitations
- Dizziness or lightheadedness
- Episodes of fainting
If you experience these symptoms frequently, seek your doctor’s help. Your doctor will examine you thoroughly to check if they are regular pregnancy changes or not.
How Fast Is The Heartbeat Throughout The Pregnancy?
The heart’s functioning varies according to the trimesters, which also affects the heartbeat. The heart rate starts to increase from the 7th week, and it peaks by 10 – 20% by the third trimester.
The stroke volume (amount of blood pumped from the heart) increases by 10% in the first half of pregnancy and reaches its peak around 20 weeks, and will remain stable until term (12).
Is Fast Heartbeat During Pregnancy Harmful?
For the most part, an accelerated heart rate is a sign of a healthy pregnancy. It shows that your body is working correctly to meet the demand for oxygen and nutrients needed by the developing baby. As long as other harmful symptoms do not accompany a rapid heartbeat, it may not be a concern.
How To Deal With Fast Heart Rate During Pregnancy?
Although an increased heartbeat is a normal physiological process, you might adapt to some lifestyle changes to keep your health, and your baby’s in check.
- Try to stay calm and beat stress by occasional intake of chamomile tea or aromatherapy.
- Get enough sleep at night regularly, ensure it is undisturbed.
- Practice relaxation techniques, such as yoga, deep breathing, and meditation.
- Drink enough water to remain well-hydrated.
Medical Treatment For Fast Heart Rate
Medications are not always the best line of treatment for accelerated heart rate and are only used in an emergency, under a doctor’s supervision. Anti-arrhythmic or beta or calcium channel blockers are commonly prescribed for tachycardia (heart rate more than normal) (13).
Next, we answer a few commonly asked questions about accelerated heartbeat during pregnancy.
Frequently Asked Questions
1. How high can my heart rate go when I am pregnant?
According to the American College of Obstetrics and Gynecology (ACOG), the heart rate of pregnant women should not exceed 140 bpm (which tends to happen during rigorous exercises) (14).
2. Does fast heart rate indicate a boy or girl?
No studies suggest that the maternal heart rate or the fetal heart rate in pregnancy indicates the gender of the fetus. It is only an old wives’ tale that fetal heart rate above 140 bpm might indicate a girl, and below that indicates a boy (15).
3. Can increased heart rate affect the baby?
Increased heart rate is a healthy change during pregnancy and is not known to affect the baby.
A faster heartbeat during pregnancy is a part of the naturally changing body. It is harmless, but that does not mean you should ignore any associated symptoms. Talk to your doctor if you see any unusual signs and symptoms to understand the actual cause. Get enough rest and stay away from all possible stressors.
If you have any experience to share or any remedies that helped you, write to us below in the comment section.
2. Farida M. Jeejeebhoy et al.; Cardiac Arrest in Pregnancy; American Heart Association (2018)
3. Monika Sanghavi & John D. Rutherford; Cardiovascular Physiology of Pregnancy; American Heart Association (AHA) Journals (2016)
4. Roberta Anniverno et al.; Anxiety Disorders in Pregnancy and the Postpartum Period; Open access peer-reviewed chapter (2012)
5. Michael E. Hall, Eric M. George,b and Joey P. Grangerb; The Heart During Pregnancy; NCBI(2013)
6. Antônio Arildo Reginaldo de Holanda et al.; Ultrasound findings of the physiological changes and most common breast diseases during pregnancy and lactation*; Radiol Bras (2016)
7. Thyroid Disease & Pregnancy; National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK)
8. Anemia in Pregnancy; University of Rochester Medical Center (2018)
9. Ekholm EM et al.; Heart rate and blood pressure variabilities are increased in pregnancy-induced hypertension; Am J Obstet Gynecol (1997)
10. Aikaterini Chamaidi et al.; Heart Disease and Pregnancy; Hellenic Journal of Cardiology (2006)
11. Dawn L Adamson and Catherine Nelson‐Piercy; Managing palpitations and arrhythmias during pregnancy; British Medical Journal
12. Raul Artal-Mittelmark; Physical Changes During Pregnancy; MSD Manuals
13. Shantanu Deshpande et al.; Beta-blockers: Are they useful in arrhythmias; SUPPLEMENT OF JAPI (2009)
14. Pre-Natal Exercise and Back Care Handbook; University of California San Francisco (2011)
15. Hope Ricciotti; Your mom was right: “Morning sickness” means a lower chance of miscarriage: Harvard Health Publishing logo (2016)