Palpitations — awareness of the heart skipping, thumping, fluttering or racing — most often come from ectopic beats (early beats followed by a compensatory pause and a forceful thump; near-universal and benign in structurally normal hearts), or from adrenaline, caffeine, alcohol, poor sleep, fever, anemia or thyroid excess speeding a normal rhythm. The pattern that needs catching is atrial fibrillation: irregularly irregular, often lasting minutes to hours, raising stroke risk — more common past 60 and worth a pulse check or ECG. Palpitations with chest pain, breathlessness, fainting or near-fainting are emergency territory, and a rhythm strip during symptoms beats any description of them.
What palpitations are
Palpitations are perception, not a diagnosis — the heart entering awareness as skips, thumps, flutters, racing or pounding. The sorting question is never "did I feel it" (attentive brains feel normal hearts) but what rhythm produced it — and the answer space is small:
Ectopic beats — the majority. Premature beats from atria or ventricles fire early into the cycle, the heart pauses to reset, the next beat fills extra and lands hard: felt as a skip-then-thump. Nearly everyone has them daily; caffeine, alcohol, stress, fatigue and fever multiply them; and in a structurally normal heart, occasional ectopics are benign enough that reassurance is the treatment. (Very frequent ectopics — many per minute, persistently — earn quantification and an echo.)
Sinus tachycardia — the revved normal rhythm. Fast but regular: adrenaline (stress, panic — FAQ), stimulants and medications, fever, dehydration, anemia, overactive thyroid, low blood sugar, pain, deconditioning. The rhythm is innocent; the driver is the finding — and several drivers (thyroid, anemia) are one blood panel away.
Atrial fibrillation — the one to catch. The atria quiver chaotically and the pulse turns patternless (FAQ's self-check): episodes commonly race, flutter and fatigue for minutes to hours, though plenty of AFib — especially older-age AFib — is silent. It matters for stroke (clots form in the quivering atrium; risk-scored anticoagulation cuts that risk by two-thirds), and for the rate-and-rhythm management cardiology now does well. Prevalence climbs steeply past 60; high blood pressure, alcohol, apnea, obesity and thyroid excess are its recruiters.
The rarer species — SVT (abrupt-on, abrupt-off racing at 150–220, often terminable with vagal maneuvers; treatable definitively by ablation), and the ventricular arrhythmias that announce themselves with the red-flag company below.
Company that changes the question
Emergency care, not observation: palpitations with chest pain or pressure, real breathlessness, fainting or near-fainting, or lasting extreme rates; palpitations in anyone with known heart disease or a family history of sudden unexplained death young; new irregular pulse with stroke-type symptoms. Prompt (this-week) assessment: suspected AFib by pulse or device, episodes that are frequent, prolonged or worsening, palpitations with the anemia/thyroid constellation (fatigue, heat intolerance, weight change), or onset alongside new medication.
Pinning the rhythm down
The whole game is rhythm during symptoms: a 12-lead ECG if episodes are ongoing; otherwise Holter (24–48 h) for daily symptoms, patch monitors (1–2 weeks) for weekly ones, event recorders or smartwatch strips for the sporadic — plus the basic panel (blood count, thyroid, electrolytes, glucose) that finds the drivable causes, and an echo where structure needs clearing. Bring the phone log: onset, offset, regularity, triggers, and any wearable strip — one good recording routinely ends months of uncertainty in either direction.
Quieting the benign kind
The audit (FAQ substances) honestly for two weeks; sleep repaired and apnea suspected out loud where it fits; hydration, meals and movement steadied (fitness raises the palpitation threshold); the anxiety loop treated as the physiology it is — breathing protocols, CBT where it has taken residence; alcohol respected as the arrhythmia drug it is, especially past 60. Magnesium's honest note: correcting a low level calms ectopics, and trial support beyond deficiency is thin — the pattern this site keeps finding. What never helps: pulse-checking as a hobby, which feeds the loop the palpitations live on.
Frequently asked questions
Why do I feel skipped beats mostly in bed at night?
Quiet plus position: lying on the left side conducts heartbeats to the chest wall like a drum, silence removes masking, and the pre-sleep brain scans the body. Ectopics also genuinely increase with the day's accumulated caffeine, alcohol and fatigue. The nighttime venue is reassuring more than alarming — dangerous rhythms don't wait for bedtime.
How do I check my own pulse for AFib?
Two fingers on the wrist for 30 seconds, attention on spacing: normal rhythm (even with skips) has an underlying regular meter; AFib has none — beats arrive with no repeating pattern, "irregularly irregular," often 100–160/min in episodes. Smartwatch ECG features detect it fairly well but false-positive freely; any device alert or suspicious self-check earns a proper ECG, not a spiral.
Can anxiety alone really cause hours of palpitations?
Yes — adrenaline is a rhythm drug, and the anxiety→palpitation→anxiety loop sustains sinus tachycardia convincingly; panic attacks add chest tightness and breathlessness that mimic cardiac events. The clean way out is one good recording during symptoms showing fast-but-regular sinus rhythm — which is treatment as much as diagnosis, because it retires the fear that fuels the loop.
Which everyday substances are the usual culprits?
Caffeine past personal tolerance (and energy-drink stacking), alcohol — including the "holiday heart" AFib of binges — nicotine, decongestants (pseudoephedrine), asthma inhaler overuse, some ADHD medications, cannabis in some, and the stimulant "fat-burner" blends this site grades elsewhere. Withdrawal states (missed beta-blocker doses, alcohol) count too. A fortnight's honest audit often ends the investigation.
References
- NHLBI. Arrhythmias (2022). https://www.nhlbi.nih.gov/health/arrhythmias
- National Heart, Lung, and Blood Institute. High Blood Pressure (2024). https://www.nhlbi.nih.gov/health/high-blood-pressure
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