Myalgic encephalomyelitis is a severe systemic, acquired disease that is defined by the World Health Organisation in the ICD-10 code G93.3 as a neurological disorder. CFS is a term that is listed in the alphabetical index linked to ME (criteria below). Some 250,000 people are thought to have ME in the UK.

ME has clear clinical symptoms which manifest predominantly based on neurological, immunological and endocrinological dysfunction.

The effects of ME are debilitating at best and devastating at worst. 25% of sufferers are severely affected and 10% are children. In a UK study ME was found to be the biggest cause of long-term absence from school1. Some sufferers are so severely affected that they cannot move, speak or swallow.

The current status of services for people with ME and their families in the UK is poor with little knowledge of current biomedical research being applied and possible treatments not being made available to patients or healthcare staff.

People with ME need early and correct diagnosis, proper treatment, and advice. The dangers for people with ME having no proper clinical examination and no access to possible treatments is that the disease can develop into more severe forms with significant loss of functioning.

There is also the danger of mis- or missed diagnosis – a common problem with people thought to suffer from ME. Studies at Newcastle University2 and St Bartholomew’s Hospital, London3 found that 40-49% of patients with a diagnosis of CFS/ME were misdiagnosed and some had other potentially treatable illnesses. Development of a reliable diagnostic biomarker and test for the disease is therefore a priority and would be of huge benefit to doctors and patients alike.

Patients with severe ME have been largely excluded from research and also from treatment as services have not been developed to meet their special needs and lack of research means that doctors have no evidence-based treatments to offer them. Invest in ME Research is changing this.

There is a mounting body of scientific evidence of the biological processes at work in ME, but there has been no cohesive strategy for taking this research forward so that biomedical findings can translate into treatments of the root cause of the disease and perhaps even prevention – this of course is why we need your help.




Myalgic encephalomyelitis is classified by the World Health Organisation in the chapter on Diseases of the Nervous System (neurological) at WHO ICD-10 G.93.3: post-viral fatigue syndrome: benign myalgic encephalomyelitis. Chronic Fatigue Syndrome is a term that is listed in the alphabetical index with a reference back to ME.

At Let’s Do It for ME we prefer to use the term ME. It keeps things simple and we think it is clear to our supporters what we mean by this term. The abbreviation ME/CFS comes from the Canadian Consensus Guidelines and the fact that the WHO lists ME and PVFS under the same category with CFS linking to it via the index. Invest in ME Research are UK distributors for the Canadian Consensus Criteria Overview document4 and use ME/CFS in relation to this document. By this they mean ME – but promotion of the best clinical guidelines means they do sometimes need to refer to ME as ME/CFS.

We are in agreement with Invest in ME Research that what really matters is the definition of ME – this is the important point.



Criteria for both ME and CFS have been developed in different countries over the years. In the UK, CFS/ME has become an umbrella diagnosis for patients whose similar symptoms may have quite different causes creating confusion for clinicians and researchers alike and a barrier to useful scientific progress.

In order to establish correct and early diagnosis there needs to be a standard clinical diagnosis method used throughout the country. The Canadian criteria are proper, up-to-date clinical guidelines which can also be used as a base for research criteria. The Invest in ME Research proposal for an examination and research facility includes a clinical biomedical lead consultant who would perform correct diagnosis using the Canadian Consensus Guidelines, perform a full examination using a standard clinical protocol and, once patients have been formally diagnosed as having ME, administer possible treatments and enable participation in biomedical research into the disease.

Using a standard diagnostic and clinical protocol the service would allow a model of care and appropriate care packages for people with severe presentations and to establish and co-ordinate a clinical network and disseminate best practice across that network. More information about ME at Frequently Asked Questions.



1 Dowsett EG, Colby J. Long-term sickness absence due to ME/CFS in UK schools; an epidemiological study with medical and educational implications. J Chronic Fatigue Syndrome 1997; 3: 29-42
2 The Newcastle NHS Chronic Fatigue Syndrome Service: not all fatigue is the same.
3 Alternative diagnoses to chronic fatigue syndrome in referrals to a specialist service: service evaluation survey
4 A Clinical Case Definition and Guidelines for Medical Practitioners: An Overview of the Canadian Consensus Document


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