Atrial Fibrillation & Flutter: Symptoms, Absence & What to Watch For

Atrial fibrillation (AFib) and atrial flutter are often asymptomatic or minimally symptomatic—“silent AF” occurs in 15–30% of cases.

Possible Symptoms

• Palpitations (irregular, rapid, “fluttering”)
• Fatigue, exercise intolerance
• Dyspnea (exertional or at rest)
• Dizziness, presyncope
• Chest discomfort
• Polyuria (ANP release)

Asymptomatic ≠ Benign

Silent AF carries same stroke risk (CHA₂DS₂-VASc score guides anticoagulation). Also risk of tachycardia-induced cardiomyopathy, cognitive decline, reduced quality of life.

Detection

• Opportunistic pulse check (≥65 or risk factors).
• ECG, Holter, event monitor, implantable loop recorder.
• Consumer wearables (PPG-based) — screening only; confirm with ECG.

Action

If you feel irregular heartbeat or have risk factors (HTN, age ≥65, diabetes, heart failure, prior stroke), discuss screening with your doctor. Early anticoagulation prevents stroke.