Cardiac Arrhythmias: Heart Palpitations and Arrhythmias: Symptoms and Next Steps
A non-diagnostic guide to palpitations, rhythm evaluation, wearable alerts, appointment preparation, and emergency warning signs.
An arrhythmia is a problem with the rate or rhythm of the heartbeat. Palpitations may feel like fluttering, pounding, racing, pauses, or skipped beats, but the sensation alone cannot identify the rhythm or its cause. Some episodes are harmless, while others need prompt assessment.
Describe the event before naming it
Instead of deciding “this is atrial fibrillation” from a sensation or watch alert, record what happened. Note whether the onset and end were sudden or gradual, whether the rhythm felt fast or irregular, how long it lasted, what you were doing, and which other symptoms appeared.
| Detail | Useful note |
|---|---|
| Timing | Date, start, end, and whether it woke you |
| Sensation | Fast, irregular, pounding, fluttering, or pause |
| Context | Rest, exercise, illness, stress, alcohol, caffeine, or new medicine |
| Other symptoms | Chest discomfort, breathlessness, dizziness, fainting, or weakness |
| Device data | Screenshot, heart rate, and whether an ECG trace was recorded |
The heart-health fundamentals guide explains how symptoms fit beside blood pressure, cholesterol, medical history, and family history.
Palpitations have more than one possible cause
Possible contributors include premature beats, an arrhythmia, fever, dehydration, anaemia, thyroid problems, medication, stimulants, alcohol, nicotine, sleep loss, anxiety, and other conditions. A plausible trigger does not prove the cause. “It happened during stress” should not be used to dismiss recurrent or concerning symptoms.
Review caffeine and other stimulants with the caffeine timing guide, but do not use a self-directed elimination experiment to delay medical assessment.
An electrocardiogram answers a different question from a watch
An electrocardiogram, often called an ECG or EKG, records the heart's electrical activity. If an episode is intermittent, a clinician may use a Holter monitor, event monitor, patch, or implantable loop recorder depending on frequency and risk. Blood tests, imaging, or an exercise test may be appropriate in some cases.
A smartwatch may flag an irregular rhythm or capture a single-lead trace, but it can miss episodes and create false alerts. Device data can support the conversation. It cannot confirm every rhythm or rule out disease. The HRV and wearable limits guide explains why a wellness score is not a rhythm diagnosis.
Prepare for a useful appointment
- Bring the event log and device screenshots.
- List prescriptions, non-prescription medicines, supplements, nicotine, caffeine, alcohol, and recreational substances.
- Describe family history of arrhythmia, fainting, sudden death, cardiomyopathy, or early cardiovascular disease.
- Report snoring, breathing pauses, thyroid symptoms, recent illness, and changes in exercise tolerance.
- Ask which symptoms should trigger urgent care and which monitoring method fits the event frequency.
Do not stop a prescribed medicine without advice. Some medicines can affect heart rate or rhythm, but the reason for treatment and the risk of stopping also matter.
Exercise decisions depend on symptoms and diagnosis
Do not push through palpitations accompanied by chest discomfort, faintness, severe breathlessness, or a sudden loss of capacity. Stop, sit or lie safely, and seek appropriate help. A clinician can advise when exercise testing or restriction is needed.
For someone cleared to exercise, gradual training may support general cardiovascular health. Use the realistic movement plan rather than jumping into maximal intervals after a concerning episode.
Stress management can help without explaining everything
Stress and panic can increase awareness of the heartbeat and change heart rate. Breathing and grounding may reduce distress, but they should not be used to prove that an episode is benign. The stress physiology guide keeps both sides of that distinction clear.
Know the emergency warning signs
Seek emergency care for palpitations with chest pain or pressure, severe difficulty breathing, fainting, new confusion, stroke signs, or symptoms that are rapidly worsening or feel immediately dangerous. Do not drive yourself when emergency care may be needed.
Arrange non-emergency medical review for recurrent episodes, a new persistent irregular rhythm, a significant change from normal, symptoms during exertion, or a wearable alert that repeats. The objective is to capture the rhythm and assess the person, not to choose a diagnosis from an app.
Avoid three common responses while waiting for review
- Do not take another person's heart or anxiety medicine.
- Do not provoke an episode with extra caffeine, intense exercise, or sleep loss in an attempt to capture it.
- Do not repeatedly check a pulse or watch score when that behaviour increases distress without adding useful information.
Continue prescribed treatment unless the clinician responsible for it advises otherwise. Keep ordinary hydration and meals appropriate to your health plan. If symptoms change or warning signs appear, update the level of care rather than waiting for the scheduled appointment.
References & Sources
- 1. Arrhythmias: Symptoms - National Heart, Lung, and Blood Institute (2022). View source
- 2. Arrhythmias: Diagnosis - National Heart, Lung, and Blood Institute (2022). View source
