What your constant fatigue REALLY means – and when it’s a sign of killer disease 

IT’S normal to feel tired from time to time.

But if you find yourself in a debilitating state of exhaustion – suffering a constant lack of energy both physically and mentally – it could be time to investigate the cause.

AlamyDo you know the difference between tiredness and fatigue?[/caption] Dr Jonathan Webster offers his advice for when it’s time to see your doctor

Understanding the difference between tiredness and fatigue is key.

While tiredness and fatigue both describe low energy...