Anxiety and Heart Palpitations: Why It Happens and When to Worry

Your heart suddenly starts pounding. It flutters, skips a beat, or hammers so hard you can feel it in your throat. Nothing happened — no running, no emergency — and yet your body is acting like you are in danger. If you have experienced anxiety and heart palpitations together, you already know how unsettling it can be. The sensation itself can feel like a medical emergency, which only makes the anxiety worse. But understanding what is actually happening inside your body can make the experience far less frightening.

Why Anxiety Makes Your Heart Race

Every heart palpitation during anxiety traces back to a single system: your fight-or-flight response. When your brain perceives a threat — real or imagined — the amygdala sends an alarm signal to the hypothalamus, which triggers your adrenal glands to flood your bloodstream with adrenaline (epinephrine) and cortisol.

Adrenaline's job is to prepare you for action. It increases your heart rate so more blood reaches your muscles. It raises your blood pressure. It sharpens your senses. This is the same cascade that would save your life if you were running from a genuine physical threat. The problem is that your nervous system cannot distinguish between a real danger and an anxious thought about tomorrow's deadline. The hormonal surge is identical in both cases.

The result is what you feel as palpitations: a racing, pounding, fluttering, or skipping sensation in your chest. Your heart is doing exactly what adrenaline is telling it to do — beating faster and harder to move blood to your major muscle groups. It is not malfunctioning. It is responding to a chemical signal.

The Palpitation–Anxiety Feedback Loop

One of the most frustrating aspects of anxiety-related palpitations is that they tend to feed on themselves. You notice your heart racing, which makes you worry something is wrong, which sends another alarm signal to the amygdala, which releases more adrenaline, which makes your heart race even faster.

This feedback loop is a major reason why palpitations can feel so overwhelming — especially during a panic attack, where the initial surge of adrenaline produces sensations that feel genuinely dangerous. Research published in the journal Neuropsychiatric Disease and Treatment found that palpitations are one of the most common complaints in cardiac clinics, occurring in 11 to 40 percent of cases, and that the cause is psychiatric rather than cardiac in roughly 31 percent of those presentations.

Breaking the loop — by understanding what is happening and giving your body a signal that the threat is not real — is one of the most effective things you can do.

How to Calm Heart Palpitations from Anxiety

Since the palpitations are driven by your sympathetic nervous system, the goal is to activate the parasympathetic nervous system — the branch that tells your body the danger has passed. Here are techniques supported by clinical evidence:

1. Slow your breathing with extended exhales. Breathing in for four counts and out for six to eight counts stimulates the vagus nerve, which sends a direct signal to your heart to slow down. This is one of the fastest non-medical interventions available. Box breathing (4-4-4-4) and the physiological sigh (double inhale through the nose, long exhale through the mouth) are both effective.

2. Splash cold water on your face. Cold water on the face triggers the dive reflex, a mammalian response that rapidly slows heart rate and lowers blood pressure. Holding an ice cube or pressing a cold, wet cloth against your cheeks and forehead can produce a similar effect. This works faster than most breathing techniques during intense episodes.

3. Try the Valsalva manoeuvre. Bear down as if you are straining — pinch your nose closed, close your mouth, and try to exhale forcefully for 10 to 15 seconds. This increases pressure in your chest and stimulates the vagus nerve. The Cleveland Clinic lists vagal manoeuvres as a first-line technique for slowing a racing heart, with a 20 to 40 percent success rate for certain fast heart rhythms.

4. Ground yourself with your senses. The 5-4-3-2-1 technique — notice five things you can see, four you can touch, three you can hear, two you can smell, and one you can taste — redirects your brain away from internal alarm signals and toward the present moment, interrupting the feedback loop.

5. Move your body gently. A short walk or gentle stretching helps burn off excess adrenaline. The fight-or-flight response prepared your muscles for action, and giving them something to do can help the chemical surge pass more quickly.

When Heart Palpitations Are Just Anxiety — and When to See a Doctor

Most anxiety-related palpitations are uncomfortable but not dangerous. They tend to come on during or after a stressful moment, last a few seconds to a few minutes, and resolve as the stress response settles. Over time, many people learn to recognise the pattern and find the sensation less alarming.

However, palpitations can sometimes signal a cardiac condition that needs medical attention. The overlap between anxiety symptoms and heart conditions is real, which is why it is always worth checking with a doctor if something feels different.

See a healthcare professional if your palpitations:

• Are new, and you have not experienced them before
• Happen frequently or do not resolve within a few minutes
• Occur at rest, without an obvious emotional trigger
• Are getting worse or happening more often over time

Seek emergency care if palpitations come with:

• Chest pain, pressure, or tightness
• Difficulty breathing or shortness of breath
• Dizziness, lightheadedness, or fainting
• Pain radiating to your jaw, neck, arm, or upper back

Getting checked is not a failure of coping — it is common sense. Once a doctor has ruled out cardiac causes (often with an ECG or Holter monitor), you can manage the anxiety component with more confidence and much less fear. And if anxiety is driving the palpitations, treatments like cognitive behavioural therapy (CBT) have strong evidence for reducing both the anxiety and the physical symptoms that come with it.

Try It in Unxiety

The next time your heart starts racing and you know it is anxiety, open Unxiety — it works fully offline, no account needed. The Breathe tab offers guided extended-exhale breathing, box breathing, and the physiological sigh, all designed to activate your vagus nerve and slow your heart rate with gentle visual pacing. If the palpitation–anxiety loop is spiralling, the Ground tab walks you through sensory grounding step by step to pull your attention out of your chest and into the present moment. And if the episode hits hard and fast, the panic button gives you an immediate, one-tap starting point.

Unxiety offers relaxation techniques, not medical care, diagnosis, or treatment. If you're in crisis or having thoughts of harming yourself, contact your local emergency services or a crisis line right away — for example, in the US, call or text 988.

Sources

• Cleveland Clinic. Heart Palpitations and Anxiety. Cleveland Clinic.
• Cleveland Clinic. Heart Racing? How Anxiety Causes Heart Palpitations. Cleveland Clinic.
• Mayo Clinic. Heart Palpitations — Symptoms and Causes. Mayo Clinic.
• Harvard Health Publishing. Calm Your Anxious Heart. Harvard Medical School.
• Johns Hopkins Medicine. When to Evaluate Heart Palpitations. Johns Hopkins Medicine.
• Cleveland Clinic. Vagal Maneuvers: How to Slow Your Heart Rate. Cleveland Clinic.
• Ehab, A. and Bassiouny, M. Relationship Between Palpitation and Mental Health. Neuropsychiatric Disease and Treatment, 2016.
• Cleveland Clinic. How to Stop Your Heart Palpitations at Home. Cleveland Clinic.