Feeling tired all the time is one of the most common complaints that GPs have to deal with.
One in five Britons say they suffer from this but, for experts, it can be difficult to determine the cause.
Doctors have told The Mail on Sunday that the majority of cases can be split into 12 categories – each with their own telltale signs. But how would they define tired all the time?
‘It isn’t the same as feeling tired after a hard day’s work,’ says Dr Dean Eggitt, a Doncaster-based GP.
‘It’s fatigue that’s not supposed to be there. Fatigue you feel even after
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