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Many home blood pressure monitors display a small icon when they detect an irregular heartbeat during a reading. Seeing it can be alarming, so it helps to understand exactly what it does — and doesn’t — mean.

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What does the irregular-heartbeat symbol mean?

The indicator means the monitor detected an uneven pulse rhythm while measuring. That can be something harmless, like an occasional extra beat, or it can reflect an arrhythmia such as atrial fibrillation (AFib). Importantly, the monitor is screening, not diagnosing — it flags irregularity for you to follow up on.

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Is an irregular reading the same as AFib?

No. An irregular-heartbeat flag is not a diagnosis of AFib. Many people get an occasional flag with no underlying heart problem, while others may have an arrhythmia that needs evaluation. Only a clinician, usually with an EKG, can diagnose AFib or another rhythm disorder.

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Why might I see it occasionally?

Movement, talking, crossing your legs, or a full bladder during measurement can all disturb the reading, and benign extra beats are common. Re-take the reading after sitting quietly for five minutes following proper technique. If the flag appears only rarely and you feel well, it is often not a cause for alarm.

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When should I see a doctor?

See your clinician if the irregular-heartbeat symbol appears frequently, or if it comes with symptoms like palpitations, a racing or fluttering heart, dizziness, breathlessness, or chest discomfort. Bring your monitor and a log of readings to the appointment. For a closer look at rhythm, a personal EKG monitor can record a tracing to share with your doctor.

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Will an irregular pulse affect my blood pressure reading’s accuracy?

It can. Home monitors rely on a steady pulse to calculate blood pressure, so a very irregular rhythm may make individual readings less reliable. Taking several readings and averaging them helps, but discuss the best monitoring approach with your doctor if you have a known arrhythmia.
Seek urgent care for a fast or irregular heartbeat with chest pain, fainting, severe shortness of breath, or weakness on one side. A home monitor and a personal EKG are screening tools that support — but never replace — medical diagnosis and care.
Related: Atrial Fibrillation · Heart Palpitations · EKG Monitor Overview · How to Measure at Home