Quick answer: Anxiety commonly causes heart palpitations through adrenaline release and hyperventilation, creating a pounding, racing, or fluttering sensation that usually lasts seconds to minutes. Episodes tied to stress or panic attacks are not dangerous to a healthy heart. However, palpitations occurring with fainting, chest pain, shortness of breath at rest, sustained rapid heartbeat, or a history of heart problems require immediate cardiac evaluation, not self-diagnosis. Always get first-time or persistent palpitations evaluated by a doctor to rule out arrhythmias, thyroid problems, and other medical causes.
RED FLAGS: When to Call 911 / Go to the Emergency Room
If you have heart palpitations with ANY of these symptoms, call 911 (US), 999 (UK), or 112 (EU) immediately or go to your nearest emergency room. Do not wait.
- Fainting, near-fainting, or dizziness during palpitations
- Chest pain or pressure accompanying palpitations
- Shortness of breath or difficulty breathing at rest
- Severe dizziness or lightheadedness
- One-sided weakness, slurred speech, or vision changes (stroke warning signs)
- Rapid heartbeat sustained for more than 1 hour without stopping
- Palpitations triggered by exertion (climbing stairs, light exercise)
- Personal history of heart disease, arrhythmia, or pacemaker/defibrillator implant
- Family history of sudden cardiac death in someone under age 50
- Known diagnosis of atrial fibrillation, supraventricular tachycardia (SVT), or ventricular arrhythmias
If you cannot reach emergency services, ask someone to drive you immediately. Do not drive yourself.
What Heart Palpitations Feel Like
Heart palpitations are an awareness of your heartbeat, often described as:
- Pounding: A forceful, thudding sensation in the chest, like your heart is "beating out of your chest"
- Racing: Rapid heartbeat, as if your heart is running or skipping
- Fluttering: A trembling or vibrating sensation, sometimes called a "flutter" or "butterflies in the chest"
- Skipped beats: A sensation that your heart briefly paused or "skipped a beat," followed by a heavy catch-up beat
- Irregular rhythm: Heartbeats that feel uneven or out of pattern
You may feel palpitations in your chest, throat, neck, or even your upper abdomen. Episodes typically last seconds to a few minutes, though residual anxiety can linger for hours.
Important distinction: Palpitations are the feeling of your heartbeat, not necessarily a sign that something is wrong with your heart. Many people without heart disease experience palpitations during stress, exercise, caffeine intake, or fever. A healthy heart can tolerate rapid or brief irregular beats without damage. However, the pattern of palpitations, your age, and accompanying symptoms determine whether medical evaluation is needed.
How Anxiety Causes Heart Palpitations
Anxiety triggers palpitations through two primary mechanisms:
1. Sympathetic Nervous System Activation
When you perceive a threat (real or imagined), your sympathetic nervous system activates the "fight or flight" response. This releases adrenaline (epinephrine) and noradrenaline (norepinephrine), which:
- Increase heart rate (chronotropic effect)
- Increase the force of each heartbeat (inotropic effect, making beats feel more forceful or "pounding")
- Increase blood pressure
- Trigger blood vessel constriction
The result: your heart beats faster and more forcefully, and you become acutely aware of it. This is normal physiology during stress, but the awareness itself can amplify anxiety (called "interoceptive amplification"), creating a feedback loop where noticing the palpitations triggers more adrenaline release and more palpitations.
2. Hyperventilation and Respiratory Alkalosis
Anxiety often causes rapid or shallow breathing (hyperventilation). Breathing too fast lowers CO2 levels in your blood, shifting pH toward alkaline (respiratory alkalosis). This:
- Constricts blood vessels in the brain and heart
- Reduces available calcium and magnesium, affecting smooth muscle tone and electrical conduction
- Disrupts the balance of electrolytes (potassium, sodium, magnesium) needed for normal heart rhythm
- Can trigger or worsen palpitations, dizziness, and tingling in the fingers and face
3. Caffeine and Stimulant Sensitivity
Anxiety-prone individuals often have heightened sensitivity to stimulants. Caffeine (coffee, tea, energy drinks, chocolate), nicotine, pre-workout supplements, and decongestants (pseudoephedrine) all increase heart rate and contractility. When combined with anxiety, they amplify palpitations dramatically.
Anxiety Palpitations vs. Cardiac Arrhythmia: How to Tell
Feature · Anxiety Palpitations · Arrhythmia (Atrial Fibrillation, SVT, etc.)
Trigger · Tied to stress, worry, or panic · Can occur at rest, during sleep, or without obvious trigger
Duration · Seconds to a few minutes · Often sustained for minutes to hours; may require medical intervention to stop
Rhythm · Regular (fast but steady) or occasionally skipped beats · Irregular, chaotic, or consistently abnormal pattern
Associated symptoms · Anxiety, worry, tension, rapid breathing, dizziness from hyperventilation · Chest discomfort, shortness of breath, fainting, severe fatigue (independent of anxiety level)
Response to breathing/rest · Usually resolves within 5-15 minutes of slow exhalation breathing or sitting down · May continue despite rest; stops only with medication or medical intervention
Syncope (fainting) · Rare; if it occurs, suspect cardiac cause · More common; a red flag for dangerous arrhythmia
Chest pain · Unlikely; if present, usually anxiety-related or musculoskeletal · More likely; may indicate decreased cardiac output or coronary involvement
Medical testing · ECG usually normal; stress test and heart imaging typically normal · ECG or rhythm monitor shows abnormal pattern; echocardiogram may show structural changes
Critical note: Only a healthcare provider can reliably distinguish anxiety palpitations from cardiac arrhythmia. Never assume palpitations are "just anxiety" without at least one medical evaluation (ECG, physical exam, and history).
When You Need a Doctor Workup for Palpitations
Get a medical evaluation if you experience:
- First-ever episode of palpitations (even if brief)
- New onset palpitations in someone age 40 or older
- Sustained palpitations lasting longer than a few minutes
- Palpitations triggered by exertion (climbing stairs, exercise), even if brief
- Palpitations with fainting, near-fainting, chest pain, or shortness of breath
- Family history of sudden cardiac death, early heart attack, arrhythmia, or inherited heart conditions
- Known heart disease (prior MI, valve disease, cardiomyopathy) or diagnosis of arrhythmia
- Pacemaker or implantable defibrillator (ICD)
- Recurrent episodes despite anxiety treatment
Standard Workup for Palpitations (Cardiac Differential)
Your doctor may order:
- Electrocardiogram (ECG): 12-lead recording of heart electrical activity. Quick, painless, captures arrhythmia if present during the test.
- Holter Monitor or Event Monitor: Portable ECG worn for 24-48 hours or longer to capture irregular rhythms during daily activity.
- Echocardiogram: Ultrasound of the heart to assess structure, valve function, and contractility. Detects cardiomyopathy, valve disease, or chamber enlargement.
- Thyroid panel (TSH, free T4): Hyperthyroidism (overactive thyroid) is a common non-cardiac cause of palpitations, mimicking anxiety symptoms.
- Electrolyte panel (potassium, magnesium, calcium): Imbalances cause arrhythmias.
- Complete blood count (CBC): Anemia (low hemoglobin) forces the heart to beat faster to deliver oxygen.
- Stress test (if cardiac concern is high): Monitors heart rhythm and blood pressure during controlled exercise.
Why this matters: Conditions like atrial fibrillation (AFib), supraventricular tachycardia (SVT), premature ventricular contractions (PVCs), and ventricular tachycardia can feel like anxiety-triggered palpitations but require specific medical treatment. Untreated AFib, for example, increases stroke risk. A thyroid disorder or anemia is easily treated once identified.
Non-Cardiac, Non-Anxiety Causes of Palpitations
Even if anxiety contributes, always rule out these medical mimics:
- Hyperthyroidism (overactive thyroid): Excess thyroid hormone increases metabolic rate and heart rate; often co-occurs with anxiety symptoms (tremor, irritability, heat intolerance, weight loss).
- Pheochromocytoma (rare): Tumor of the adrenal gland releasing excess epinephrine and norepinephrine; causes severe palpitations, sweating, headache, and hypertension.
- Anemia: Low hemoglobin reduces oxygen delivery, forcing the heart to beat faster and harder to compensate.
- Fever or infection: Elevated body temperature increases metabolic demands and heart rate.
- Dehydration: Low blood volume causes compensatory tachycardia.
- Caffeine, nicotine, or stimulants: Direct heart rate increase; exacerbated in anxiety-prone people.
- Alcohol or alcohol withdrawal: Alcohol is a vasodilator and arrhythmogenic; withdrawal causes sympathetic hyperactivity (can be life-threatening).
- Energy drinks and pre-workout supplements: Often contain high doses of caffeine, taurine, or herbal stimulants (yohimbe, synephrine).
- Medications: SSRIs (first 2-4 weeks, usually transient), bronchodilators (albuterol), decongestants (pseudoephedrine, phenylephrine), thyroid replacement (if over-dosed), tricyclic antidepressants, stimulant ADHD medications.
- Pregnancy: Increased blood volume and cardiac output; hormone shifts; anemia risk.
- Perimenopause: Hot flashes, progesterone withdrawal, and adrenaline sensitivity increase palpitations.
- Electrolyte imbalance: Low potassium, magnesium, or calcium disrupts cardiac electrical conduction.
How to Calm Palpitations in the Moment
If you experience palpitations and have been medically cleared (no cardiac diagnosis):
- Slow exhalation breathing: Breathe in for a count of 4, hold for a count of 4, exhale for a count of 6-8. The longer exhalation activates the vagus nerve and parasympathetic nervous system, slowing heart rate. Repeat 10-15 cycles.
- Cold water on face (Mammalian Diving Reflex): Splash cold water on your face or hold an ice pack against your forehead for 20-30 seconds. This triggers the vagus nerve and can abruptly slow heart rate. Avoid if you have undiagnosed cardiac conditions.
- Sit or lie down: Reduce orthostatic stress and allow blood to return to the heart. Elevate your legs if dizzy.
- Avoid Valsalva maneuver unless instructed: Forcing a hard exhalation against a closed airway (sometimes used medically for SVT) can be dangerous without proper training. Do not attempt this without a cardiologist's guidance.
- Reduce caffeine, nicotine, and stimulants: Immediately avoid coffee, energy drinks, tobacco, and medications containing stimulants for the rest of the day.
- Eat something: Low blood sugar (hypoglycemia) can trigger palpitations. A small snack with carbs and protein can help.
- Wait it out: Most anxiety-triggered palpitations resolve within 5-15 minutes on their own.
Do not: Drive or operate machinery if palpitations are severe or accompanied by dizziness. Pull over and call for help if symptoms occur while driving.
Long-Term Management: Treating Underlying Anxiety
Palpitations that recur despite a normal cardiac workup point to undertreated anxiety. Address the root cause:
Cognitive Behavioral Therapy (CBT)
CBT is first-line treatment for anxiety disorders, including health anxiety and interoceptive fear (fear of bodily sensations like palpitations). A therapist teaches:
- Realistic appraisal of palpitations (heart is not in danger)
- Interoceptive exposure (gradually tolerating palpitations without panic)
- Cognitive techniques to interrupt catastrophic thinking ("my palpitations mean I'm dying")
- Behavioral strategies (graded exposure, activity scheduling)
Evidence: CBT has robust support from meta-analyses and randomized controlled trials (RCTs) for anxiety disorders and panic disorder.
Medications
SSRIs and SNRIs (first-line):
- Sertraline, paroxetine, escitalopram, venlafaxine, duloxetine
- Onset: 2-4 weeks; full effect at 8-12 weeks
- Note: Some SSRIs can briefly increase anxiety or palpitations in the first 1-2 weeks; this usually resolves
Beta-blockers (symptomatic relief):
- Propranolol (40-120 mg/day) blocks adrenaline's effects on the heart, reducing heart rate and contractility
- Does not treat underlying anxiety but dampens physical palpitation sensation
- Often combined with CBT or SSRI for faster symptom relief
- Contraindicated in asthma, COPD, bradycardia, or uncontrolled heart failure
Benzodiazepines (short-term only):
- Provide rapid anxiety relief but carry dependence risk; reserved for acute episodes or bridge while waiting for SSRI to work
- Not suitable for long-term daily use
Lifestyle Modifications
- Eliminate caffeine: Reduce or eliminate coffee, tea, energy drinks, cola, and chocolate. Withdraw gradually to avoid headache.
- Avoid nicotine: Smoking and vaping directly increase heart rate and arrhythmia risk.
- Limit alcohol: Alcohol is arrhythmogenic and impairs sleep, worsening anxiety.
- Regular exercise: 150 minutes of moderate aerobic activity per week improves heart health, reduces anxiety, and increases heart rate variability (HRV), a sign of cardiac resilience.
- Sleep hygiene: 7-9 hours nightly; anxiety worsens with sleep deprivation, and poor sleep increases arrhythmia risk.
- Stress management: Meditation, yoga, journaling, or time in nature reduce sympathetic activation.
- Hydration and nutrition: Dehydration and electrolyte imbalance trigger palpitations; adequate potassium (bananas, spinach, sweet potato) and magnesium (nuts, seeds, leafy greens) matter.
Repeated ER Visits for Palpitations: A Sign of Undertreated Anxiety
If you find yourself making repeated emergency department visits for palpitations despite normal cardiac workup, your anxiety is likely undertreated. A typical trajectory:
- Cardiology clears you (normal ECG, echocardiogram, stress test)
- You still experience palpitations and fear recurs
- You return to the ER for reassurance
- The ER cycle becomes a safety behavior, reinforcing anxiety rather than resolving it
Solution: Once cardiology gives the all-clear, pivot to a psychiatrist or anxiety specialist for:
- Optimization of SSRI or SNRI dose
- Cognitive-behavioral therapy focusing on health anxiety and interoceptive exposure
- Discussion of whether propranolol or another beta-blocker is appropriate as a bridge while therapy takes hold
A therapist trained in interoceptive exposure will help you deliberately tolerate palpitations in a safe setting, proving to your nervous system that they are not dangerous. This breaks the fear-palpitation cycle.
Frequently Asked Questions
Can anxiety cause heart palpitations?
Yes. Anxiety triggers adrenaline release and hyperventilation, both of which increase heart rate and awareness of heartbeats. Palpitations are one of the most common physical symptoms of anxiety and panic disorder.
How do I know if my palpitations are anxiety or my heart?
You cannot reliably self-diagnose. A doctor can review your history, perform an ECG, and possibly order a monitor or echocardiogram to rule out arrhythmias. General clues favoring anxiety: palpitations tied to stress, resolving within minutes of breathing exercises or rest, and no associated chest pain or fainting. Clues favoring cardiac cause: sustained palpitations, fainting, chest pain, exertional trigger, or abnormal ECG findings.
How long do anxiety palpitations last?
Usually 5-30 minutes. An acute panic attack causes intense palpitations that peak within 10 minutes and subside over 20-30 minutes. General anxiety can cause shorter bursts (seconds to minutes) or a persistent "flutter" that waxes and wanes over hours.
Can anxiety cause atrial fibrillation?
Anxiety itself does not cause AFib, but anxiety can trigger episodes in someone with underlying AFib or increase the risk of first-episode AFib in genetically susceptible individuals. AFib is an abnormal heart rhythm requiring treatment (anticoagulation, rate control, possible cardioversion or ablation). It is distinct from anxiety palpitations but feels similar. Any sustained irregular heartbeat lasting more than a few minutes warrants evaluation.
Should I see a cardiologist?
Yes, if palpitations are new, frequent, sustained, exertional, or accompanied by chest pain, fainting, or shortness of breath. Your primary care doctor can do an initial ECG and refer you if needed. Even if palpitations feel "anxiety-related," one cardiac evaluation is essential to rule out hidden arrhythmias or structural problems.
Do beta-blockers stop anxiety palpitations?
Beta-blockers like propranolol reduce heart rate and suppress the sensation of palpitations by blocking adrenaline's effects. They are effective for symptom relief but do not treat underlying anxiety. They work best combined with therapy or medication addressing anxiety itself. Effects are felt within 30-60 minutes of a dose.
Is it normal to feel my heart beating at night?
Mild awareness of your heartbeat when lying still is common and usually not a sign of illness. However, if you experience rapid, forceful, or irregular heartbeats repeatedly at night, or if the sensation prevents sleep, seek a medical evaluation. Nighttime palpitations can be triggered by reflux, sleep apnea, sleep position, or cardiac arrhythmias.
Can anxiety cause palpitations every day?
Yes. Chronic anxiety or generalized anxiety disorder (GAD) can cause daily physical symptoms, including constant awareness of heartbeat, occasional fluttering, or frequent episodes of rapid heartbeat. Daily palpitations warrant a full medical workup to exclude thyroid dysfunction, anemia, arrhythmia, and medication side effects. Once cardiac and medical causes are ruled out, anxiety treatment (therapy and/or medication) often resolves daily palpitations.
When to Contact Your Doctor vs. Emergency Services
Situation · Action
First-ever palpitation episode (felt fine for days/years before) · Schedule doctor appointment within 1 week; not emergency unless accompanied by red flags
Palpitations lasting > 30 min, new pattern, or increasing frequency · Call doctor for same-day or next-day appointment
Palpitations + dizziness, chest pain, shortness of breath, or weakness · Call 911 or go to ER immediately
Palpitations + fainting or loss of consciousness · Call 911 immediately
Palpitations in someone with known heart disease or arrhythmia · Call your cardiologist or 911 depending on severity
Recurrent palpitations despite normal cardiac workup · Schedule psychiatry/anxiety specialist consultation for anxiety treatment optimization
External Resources and Tier-1 Sources
Cardiac organizations:
- American Heart Association (AHA): Palpitations and arrhythmia fact sheets
- American College of Cardiology (ACC): Arrhythmia diagnosis and management guidelines
- British Heart Foundation (BHF): Palpitations information sheet
Mental health organizations:
- National Institute of Mental Health (NIMH): Panic disorder and anxiety fact sheets
- American Psychiatric Association (APA): Diagnostic and treatment guidance (DSM-5)
Medical references:
- Mayo Clinic: Comprehensive symptom and differential guides
- Cleveland Clinic: Clinical evidence-based articles
- NHS (UK National Health Service): Patient-facing information
- Harvard Health: Wellness and medical explanations
- PubMed Central (NIH): Peer-reviewed research on anxiety, palpitations, and cardiac health
Crisis Resources
If you are in a mental health crisis or thinking of harming yourself:
- National Suicide Prevention Lifeline (US): 988 (call or text)
- Crisis Text Line (US): Text HOME to 741741
- Samaritans (UK/Ireland): 116 123
- SAMHSA National Helpline (US, free, confidential): 1-800-662-4357 (24/7)
- International Association for Suicide Prevention: https://www.iasp.info/resources/Crisis_Centres/ (findahelpline.com)
- Postpartum Support International (PSI) Helpline: 1-800-944-4773 (perinatal mental health)
If you are having chest pain or cardiac emergency symptoms:
- Emergency (US): 911
- Emergency (UK): 999
- Emergency (EU): 112
Last reviewed: April 23, 2026
Medical reviewer: Pending
This post is for educational purposes and is not a substitute for medical advice. Always consult a healthcare provider for chest pain, palpitations, or mental health concerns. If you have a life-threatening emergency, call emergency services immediately.