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Heart Palpitations Causes: What Triggers Them?

Heart palpitations describe an uncomfortable awareness of your own heartbeat. Causes range from stress and caffeine to underlying heart conditions that may require medical attention.

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Heart palpitations describe an uncomfortable awareness of your own heartbeat. Causes range from stress and caffeine to underlying heart conditions that may require medical attention.

What Are Heart Palpitations?

Heart palpitations, also known as tachycardia when the heart rate is elevated, refer to the subjective sensation of a fast, strong, or irregular heartbeat. The feeling may be described as fluttering, pounding, or skipping. Palpitations are very common and usually harmless, but in some cases they may signal an underlying heart condition that requires medical evaluation.

Common Causes of Heart Palpitations

Psychological and Emotional Triggers

Stress and anxiety: Emotional stress activates the sympathetic nervous system, releasing adrenaline and accelerating the heart rate.
Panic attacks: Often accompanied by intense palpitations, chest tightness, and shortness of breath.

Lifestyle and Dietary Factors

Caffeine: Excessive intake from coffee, energy drinks, or tea can stimulate the heart and cause palpitations.
Alcohol: Can trigger heart rhythm disturbances, particularly atrial fibrillation.
Nicotine: Stimulates the cardiovascular system and increases heart rate.
Sleep deprivation: Can disrupt the autonomic nervous system and contribute to palpitations.
Physical exertion: A faster heartbeat during exercise is normal; however, palpitations that persist after rest should be evaluated.

Medical Causes

Hyperthyroidism (overactive thyroid): An overactive thyroid gland accelerates metabolism and consistently raises heart rate.
Anemia: A low red blood cell count forces the heart to pump faster to maintain adequate oxygen delivery.
Low blood pressure (hypotension): The heart compensates by beating faster.
Fever and infections: Elevated body temperature increases heart rate.
Dehydration: Fluid loss can trigger a reflex increase in heart rate.
Electrolyte imbalances: Low levels of potassium, magnesium, or calcium can disrupt the heart's electrical conduction system.

Heart Conditions

Atrial fibrillation: A common arrhythmia in which the upper chambers of the heart beat irregularly and rapidly.
Supraventricular tachycardia (SVT): Sudden-onset episodes of rapid heart rate that typically start and stop abruptly.
Ventricular arrhythmias: Potentially dangerous rhythm disturbances originating in the lower chambers of the heart.
Heart valve disease: Can impair blood flow and lead to palpitations.

Medications and Substances

Certain medications such as thyroid hormones, beta-2 agonists (used for asthma), decongestants, and some antidepressants may cause palpitations as a side effect.
Recreational drug use (e.g., cocaine, amphetamines) can trigger life-threatening arrhythmias.

Symptoms and Associated Complaints

Heart palpitations often occur alongside other symptoms that may point to the underlying cause:

Dizziness or lightheadedness
Shortness of breath
Chest pain or tightness
Fainting (syncope)
Sweating
Feelings of anxiety or inner restlessness

When to See a Doctor

Palpitations that are brief and resolve on their own are usually not a cause for concern. However, medical evaluation is strongly recommended if:

palpitations occur frequently or persist over time,
they are accompanied by chest pain, shortness of breath, or dizziness,
a fainting episode has occurred,
there is a family history of heart disease,
palpitations begin without an identifiable trigger.

Diagnosis

Several diagnostic tests are available to identify the cause of heart palpitations:

ECG (Electrocardiogram): Records the heart's electrical activity to detect rhythm abnormalities.
Holter monitor (24-hour ECG): A portable device worn for 24-48 hours to capture intermittent events.
Blood tests: Evaluate thyroid function, electrolyte levels, blood count, and other parameters.
Echocardiography: An ultrasound of the heart to assess structure and function.
Stress test (exercise ECG): Measures heart rhythm under physical exertion.

Treatment

Treatment of heart palpitations depends on the underlying cause:

Benign causes: Reducing caffeine, alcohol, and stress; ensuring adequate sleep and hydration.
Heart rhythm disorders: Medication (e.g., beta-blockers, antiarrhythmics), cardioversion, or catheter ablation.
Hyperthyroidism: Thyroid medication, radioiodine therapy, or surgery.
Anemia: Iron or vitamin supplementation depending on the cause.
Psychological triggers: Stress management, psychotherapy, and relaxation techniques.

References

Mayo Clinic: Heart palpitations - Symptoms and causes. Rochester, MN, 2023. (www.mayoclinic.org)
European Society of Cardiology (ESC): Guidelines for the Management of Patients with Ventricular Arrhythmias and the Prevention of Sudden Cardiac Death. European Heart Journal, 2022.
Zimetbaum P, Josephson ME: Evaluation of patients with palpitations. New England Journal of Medicine, 1998; 338(19):1369-1373.

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