Abnormal illness behaviour
Eisenberg [11] has suggested that the chronic aftermath of acute infection with influenza represents a pattern of persistent illness behaviour precipitated by a disease episode in a group of psychologically vulnerable individuals. Once sanctioned by a doctor, the symptoms are more likely to persist; the persistence of the symptoms is mistaken for confirmation of the diagnosis. The diagnosis of chronic brucellosis is no longer fashionable, 30 years after its 'discovery' it has become clear that 'it is a spurious disease construct which legitimizes and thereby perpetuates chronic illness behaviour'. He goes on to say that there have been a number of successors such as 'chronic mononucleosis', and would no doubt include PVFS in its various guises. He considers them to be the somatic presentation of personal distress, 'legitimised by a newly fashionable diagnosis'.
It is possible to understand chronic fatigue in terms of chronic abnormal illness behaviour; cognitive and behavioural changes lead to symptom perpetuation. The obvious advantage of such an understanding is that it encompasses the disciplines of both psychiatry and physical medicine by recognising the continual interplay between psychological and organic factors which occur in any illness, and suggests a multi-factorial approach to treatment.
The recognition of PVFS by the Department of Health can be viewed as an attempt to legitimise the sick role, and thus regard the chronic illness behaviour manifested by the patients within the ambit of 'normal' illness behaviour. Furthermore, the patients' illness behaviour is likely to be perpetuated by adhering strictly to the advice given by the powerful self-help group, the 'M.E. Society', which advocates total rest.