You don’t usually notice your heart beating. It just gets on with the job – steady, reliable, unnoticed. Until it isn’t.
Atrial fibrillation (AF) is the most common heart rhythm disorder, and it changes that steady beat into something far more chaotic. Instead of a smooth, coordinated contraction, the upper chambers of the heart (the atria) quiver. The result? An irregular and often rapid pulse that can feel like your heart is fluttering, racing, or skipping altogether.
Sometimes people feel it immediately. Others have no idea it’s happening.
What’s actually going on?
In a healthy heart, electrical signals travel in a clear, organised pathway. Think of it like a well-run train system – everything arrives on time, in sequence.
With AF, those electrical signals become disorganised. Multiple signals fire at once, creating a kind of electrical traffic jam. The atria stop contracting properly and instead fibrillate, essentially twitching rather than pumping.
This matters because the heart becomes less efficient. Blood isn’t moved as effectively, and in some cases, it can pool in the atria.
Why does it matter?
The biggest risk with atrial fibrillation isn’t the sensation, it’s the consequences.
When blood pools, it can clot. If a clot travels from the heart to the brain, it can cause a stroke. In fact, AF increases stroke risk by up to five times.
It can also lead to:
- Fatigue and reduced exercise tolerance
- Shortness of breath
- Dizziness or light-headedness
- Long-term heart weakening (heart failure)
But here’s the tricky part: many people have no symptoms at all. AF is often picked up incidentally during a routine check or after a complication.
Who gets it?
Atrial fibrillation becomes more common with age, but it’s not just an “older person’s condition.”
Risk factors include:
- High blood pressure
- Heart disease
- Diabetes
- Obesity
- Excess alcohol consumption
- Sleep apnoea
There’s also a growing recognition that lifestyle plays a significant role. Chronic stress, poor sleep, and low physical activity all nudge the system in the wrong direction.
Can it be treated?
Yes, and effectively.
Management usually focuses on three things:
Controlling the rhythm or rate
Doctors may aim to restore a normal rhythm or simply control how fast the heart beats. This can involve medication or procedures like cardioversion (resetting the heart rhythm).
Reducing stroke risk
This is critical. Many people with AF are prescribed anticoagulants (blood thinners) to reduce the chance of clot formation.
Addressing underlying causes
This is where lifestyle comes in. Improving cardiovascular health can significantly reduce the burden of AF.
The lifestyle piece
While medication plays a key role, AF is strongly influenced by how you live.
Evidence consistently shows that the following can help:
- Regular aerobic exercise (moderate, consistent – not extreme)
- Weight management
- Limiting alcohol
- Managing sleep quality
- Treating conditions like high blood pressure and diabetes
This isn’t about perfection; it’s about improving the odds.
The bottom line
Atrial fibrillation is common, often silent, and potentially serious – but it’s also manageable.
The key is awareness.
If you notice an irregular pulse, unexplained fatigue, or episodes of heart racing, it’s worth getting checked..
Your heart doesn’t need to be perfect. But it does need to be predictable enough to do its job well.
And when that rhythm goes off script, it’s not something to ignore.