Where your DNA places you among other people, and the studies behind it.
Not tailored to your result, and not medical advice
Keep Blood Pressure in a Healthy Range: Hypertension is one of the most common modifiable risk factors for AFib and contributes to left atrial enlargement and fibrosis. The lifestyle levers with the best evidence are regular aerobic activity, keeping weight in a healthy range, limiting alcohol, and a diet low in sodium and rich in vegetables, fruit and potassium. Circulation (AHA Scientific Statement)
Maintain a Healthy Weight: Obesity raises AFib risk and promotes atrial structural remodelling. In the LEGACY follow-up study, overweight and obese patients who lost and sustained at least 10% of body weight were about 5.6 times more likely to remain free of AFib than those with little or no weight loss, making weight management one of the more powerful lifestyle interventions. Journal of the American College of Cardiology (LEGACY study)
Reduce or Eliminate Alcohol: Heavy and binge drinking are well-established AFib triggers ('holiday heart syndrome'), and regular moderate intake is also associated with increased risk. In a randomized trial of regular drinkers with AFib, abstinence reduced arrhythmia recurrence and overall AFib burden over six months. New England Journal of Medicine (randomized trial)
Take Sleep-Disordered Breathing Seriously: Obstructive sleep apnea is associated with roughly double the risk of AFib. Loud snoring, choking or gasping in the night, and heavy daytime sleepiness are the signs worth raising with a clinician rather than living with. Weight management, avoiding alcohol close to bedtime, and not sleeping on your back all reduce its severity. Circulation (AHA Scientific Statement)
Pay Attention to Your Pulse: Stroke is the first sign of AFib in a meaningful share of cases, so an irregular rhythm is worth noticing early. Smartwatches and wearable ECG devices can flag irregular rhythms, and checking your own pulse costs nothing. Anything persistent or symptomatic is worth a proper evaluation, since a wearable alert is a prompt and not a diagnosis. Cureus (2025 review)
How much of this is genetic?
Genetics explains 62% of why people differ in this trait. The rest is environment, daily habits and chance.
Heritability estimate: Christophersen 2009, Circ Arrhythm Electro
Background and further reading
Atrial fibrillation (AFib) is the most common sustained cardiac arrhythmia, affecting roughly 60 million people worldwide [1]. It involves disorganised electrical activity in the upper chambers (atria) of the heart, producing an irregular and often rapid heartbeat. AFib raises the risk of ischaemic stroke about fivefold and also increases the risk of heart failure and cardiovascular death. The lifetime risk after age 45 is about 1 in 3 to 1 in 5, and prevalence climbs steeply with age, exceeding 10% in people over 80 [1]. Men have a higher age-adjusted prevalence than women.
Genetic Basis: Twin studies estimate the heritability of AFib at about 62% [2]. The strongest and earliest GWAS signal sits at the 4q25 locus near PITX2, a transcription factor central to pulmonary vein and left atrial development; a single common variant here raises AFib risk substantially. The largest meta-analysis to date, covering more than 180,000 cases, identified over 350 genome-wide significant loci, with candidate genes clustered around cardiac muscle contractility, heart muscle development, and cell-to-cell communication [3]. KCNN3 (a potassium channel) and ZFHX3 are also consistently implicated. The genetic architecture spans rare high-impact ion channel mutations in familial cases and many common polygenic variants affecting cardiac structure and electrophysiology, and polygenic scores built from these variants now improve risk prediction over clinical factors alone [3].
Risk Factors: Modifiable risk factors include hypertension, obesity, heavy and binge drinking ('holiday heart syndrome'), obstructive sleep apnea, diabetes, and physical inactivity, and addressing them lowers AFib incidence and burden [4]. Long-term endurance athletes have a higher risk than the general population, likely from atrial remodelling driven by sustained volume overload, with some studies reporting roughly twice the odds. Air pollution (fine particulate matter, PM2.5) and noise are emerging environmental contributors. Most cases arise from the interaction between genetic predisposition and cardiovascular risk factors that accumulate with age.
The published research behind your score, and the variants it draws on.
49 published scores from 19 studies
The atrial fibrillation score combines 49 polygenic scores drawn from 19 published studies.
Ohta R (2024). A polygenic score method boosted by non-additive models. Nat Commun: 3k
These traits are influenced by some of the same genes and variants as this one
Content updated August 2026.
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