Around 1.7 million people in England could be living with heart disease, lung cancer or lung disease without knowing it, Public Health England (PHE) is warning.

The watchdog said anyone with an ongoing cough or who gets out of breath more easily should visit their GP as soon as possible.

Figures suggest around 80,000 people in England have undiagnosed lung cancer.

A million people have undiagnosed chronic obstructive pulmonary disease (COPD), which includes emphysema and chronic bronchitis, and another 600,000 people are living with undiagnosed heart disease.