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Health library/Atrial Fibrillation

Heart and circulation

Atrial Fibrillation

Also known as: AF, AFib

Atrial fibrillation is an irregular heart rhythm involving the upper chambers. It can increase the likelihood of stroke, even when palpitations are absent.

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What you may notice

Symptoms can overlap with other conditions and vary between people.

  • Racing or irregular heartbeat
  • Fatigue
  • Breathlessness
  • Lightheadedness

Understanding care

Clinical care may include rhythm confirmation, stroke-risk review and discussion of suitable management options. A qualified clinician decides which investigations and options fit the individual situation.

When to seek help

Seek assessment for new or recurring exertional symptoms. Call emergency services (112 in India) for sudden or persistent chest discomfort, severe breathlessness or fainting.

For severe breathing difficulty, collapse, suspected stroke, or another emergency, call local emergency services immediately. In India, call 112.

Read the medical sources

These sources support the educational article and offer more detail.

Educational reading · Updated 6 October 2026

Prepared from the linked sources. This summary has not had an independent clinician review. A qualified clinician can assess symptoms and explain which information applies to you.

A child and a caring grown-up reading a picture book together

LITTLE PEOPLE. BIG FEELINGS.

It’s okay to have
a lot of questions.

A doctor visit or an unfamiliar health word can feel scary. You can ask a trusted grown-up to help you understand, one small question at a time.

01

Say how you feel.

“I feel worried” is a good place to start.

02

Ask for simple words.

“Can you explain that in a way I understand?”

03

Bring someone you trust.

A caring adult can help you ask and listen.

For children and their grown-ups. This illustration explains a conversation, not a diagnosis. An adult should seek qualified care for a child who is unwell.

Atrial Fibrillation — First AID health library