More than a million people in the UK now live with a condition that causes the heart to beat irregularly and can lead to strokes.
Data from the British Heart Foundation (BHF) shows the UK has, for the first time, topped the million mark in the number of people diagnosed with atrial fibrillation.
The figure is up almost 20% on five years ago. High blood pressure, heart valve disease and binge drinking are among the causes alongside the fact people are living longer.
More top news
A band of rain will cross England and Wales through the rest of today.
As Princess Charlotte celebrates her first birthday on Monday, the young royal has received letters and gifts from 64 countries worldwide.
A 36-year-old man has been shot dead during a police operation in Kent.