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How it affects people

The clinical and everyday impact of ME/CFS on health, work, study, relationships and quality of life, and why it's so often missed.

3 min read Last reviewed 8 November 2026

How big is the problem?

Estimate
Worldwide A 2020 meta-analysis of 46 studies put prevalence at roughly 0.4–0.7% of people, which means tens of millions worldwide; advocacy groups cite 17–24 million before COVID-19. Long COVID has added substantially to that.1,2
United States 836,000 to 2.5 million people (Institute of Medicine, 2015); the CDC now says up to 3.3 million3,4
Australia The NHMRC estimates 0.2–1% of the population, or 48,000 to 250,000 people5
Undiagnosed The Institute of Medicine estimated 84–91% of people with ME/CFS had not been diagnosed; in one US study only 16% of people meeting criteria had a diagnosis3,6

These numbers are estimates. ME/CFS is under-diagnosed, and counting it depends on which diagnostic criteria are used. Around one in four people with ME/CFS are housebound or bedbound at some point.3,7 The economic cost to Australia has been estimated at between $1.4 billion and $14.5 billion a year.8,9

Quality of life

Studies that measure quality of life have found people with ME/CFS score lower than people with many other serious chronic illnesses. A Danish study of 20 conditions found ME/CFS had the lowest quality-of-life score of all, below multiple sclerosis and stroke; a UK study found physical function scores lower than in cancer, diabetes, heart disease and rheumatoid arthritis.10,11,12 The biggest hits are to physical function, energy and the ability to carry out usual roles.

Everyday impact

Daily life

Showering, cooking, shopping or a phone call can each take a whole day’s energy. Many people have to choose between a shower and a conversation.

Work & study

Many people with ME/CFS can’t work full time, and many can’t work at all. Young people often miss large amounts of school or university.

Relationships

Social life shrinks to protect energy. Because people can look well, friends and family may not believe how sick they are.

Money

Lost income and out-of-pocket costs for tests, supplements, allied health and aids add up, often while applying for support is itself exhausting.

The impact of disbelief

For decades, many people with ME/CFS were told their illness was psychological, or that they needed to exercise more. Many still are. This has real consequences:

  • Delayed diagnosis: years of uncertainty, often while unknowingly making the illness worse
  • Unhelpful advice: rigid graded exercise therapy was standard for decades; it’s no longer recommended, and many patients report being made worse by it
  • Isolation: not being believed by doctors, employers or family
  • Mental health strain: the grief and isolation of a serious illness that others dismiss

Things are changing. The US CDC dropped graded exercise and CBT from its recommendations in 2017, and the UK’s NICE guideline (2021) says not to offer exercise as a cure.13,14 Australia’s NHMRC is developing the country’s first ME/CFS clinical guideline, funded with $1.1 million, with a draft expected in 2027.15,16

Severe ME/CFS

People with severe and very severe ME/CFS are often invisible because they can’t leave home to be seen. They may:

  • be bedbound in a dark, quiet room
  • be unable to tolerate light, sound, touch or conversation
  • need help with eating, washing and toileting
  • have trouble swallowing or need tube feeding

Care for people with severe ME/CFS has to be adapted: shorter visits, reduced sensory load, and home-based care where possible. See Severe & very severe ME/CFS.

Impact on carers and families

Families often take on a large amount of care, admin and advocacy. That takes its own toll. The page For family & carers covers how to help without burning out.

Why early recognition matters

The best window to stop a decline is early, while the illness is still mild. Recognising ME/CFS early and pacing from the start gives the best chance of stabilising or improving.

References

  1. Systematic review and meta-analysis of the prevalence of chronic fatigue syndrome/myalgic encephalomyelitis (CFS/ME) Observational
    Lim EJ et al., Journal of Translational Medicine, 2020. 46 studies; pooled prevalence roughly 0.4–0.7% of the population; higher in women
  2. About the disease News
    Solve M.E., 2026. Advocacy organisation estimate of 17–24 million people worldwide
  3. Beyond Myalgic Encephalomyelitis/Chronic Fatigue Syndrome: Redefining an Illness Report
    Institute of Medicine (US), National Academies Press, 2015. 836,000 to 2.5 million Americans; 84–91% undiagnosed; at least one quarter house- or bedbound at some point
  4. ME/CFS: about Guideline
    US Centers for Disease Control and Prevention, 2024
  5. ME/CFS Guideline
    National Health and Medical Research Council (Australia), 2026. Prevalence 0.2–1%, approximately 48,000 to 250,000 people in Australia
  6. Factors influencing the diagnosis of chronic fatigue syndrome Observational
    Solomon L, Reeves WC, Archives of Internal Medicine, 2004. Only 16% of people meeting criteria had previously been diagnosed
  7. Housebound versus nonhousebound patients with myalgic encephalomyelitis and chronic fatigue syndrome Observational
    Pendergrast T et al., Chronic Illness, 2016. Housebound patients made up one quarter of the sample
  8. The economic burden of ME/CFS in Australia Observational
    Zhao T et al., Australian Health Review, 2023. $1.38–10.09 billion a year; about $63,400 per patient
  9. The economic impacts of ME/CFS in an Australian cohort Observational
    Close S et al. (Marshall-Gradisnik S), Frontiers in Public Health, 2020. Estimated annual cost to Australia of $14.5 billion
  10. The health-related quality of life for patients with myalgic encephalomyelitis/chronic fatigue syndrome (ME/CFS) Observational
    Falk Hvidberg M et al., PLoS One, 2015. ME/CFS scored lowest of 20 compared conditions, including MS, rheumatoid arthritis, heart failure and cancers
  11. The functional status and well being of people with ME/CFS and their carers Observational
    Nacul LC et al., BMC Public Health, 2011. Physical function scores lower than in cancer, diabetes, heart disease, lung disease and rheumatoid arthritis
  12. Functional status and well-being in people with ME/CFS compared with people with multiple sclerosis and healthy controls Observational
    Kingdon CC et al., PharmacoEconomics Open, 2018
  13. Why did it take the CDC so long to reverse course on debunked treatments for chronic fatigue syndrome? News
    Rehmeyer J, Tuller D, STAT News, 2017
  14. Myalgic encephalomyelitis (or encephalopathy)/chronic fatigue syndrome: diagnosis and management (NG206) Guideline
    National Institute for Health and Care Excellence (UK), 2021
  15. Backing belief with better support for people with chronic fatigue News
    Minister for Health and Aged Care, 2024. $1.1 million to the NHMRC to develop clinical guidelines
  16. ME/CFS clinical practice guideline development Guideline
    National Health and Medical Research Council (Australia), 2026. Indicative timeline: draft guideline in 2027, release by late 2027 or 2028