DO you ever feel short of breath or light-headed?
It could be a symptom of atrial fibrillation, a heart condition that can often go undiagnosed.
Dr Zoe Williams answers your health queriesA study of 10.5million US adults revealed that cases could be three times more common than previously thought.
In the UK, it is thought that 1.5million people have AF.
But an estimated 270,000 people are undiagnosed and unaware, according to the British Heart Foundation.