What is atrial fibrillation, the heart condition US President Joe Biden lives with?

Atrial fibrillation affects 37.5 million people worldwide, putting them at an increased risk of stroke. Even US President Joe Biden has atrial fibrillation, and yet many people don’t realise that they have the condition. Read Ritu’s article in The Conversation to find out what atrial fibrillation is, how to know whether you have it or not, and why it’s so important for people with atrial fibrillation to have their blood pressure controlled.