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Chronic Fatigue Syndrome

A condition involving severe, persistent fatigue that is not improved by rest and may be associated with Gulf War illness or deployment-related multi-symptom conditions.

Veteran
  • What exactly is chronic fatigue syndrome?
    MedlinePlusMay 2026

    ME/CFS is a serious, long-term illness that affects many body systems and causes extreme tiredness that doesn't go away with rest. It can make it hard or impossible to do your normal activities, and sometimes people can't even get out of bed.

  • Why do I feel so tired all the time with ME/CFS?
    MedlinePlusMay 2026

    Doctors don't know exactly why ME/CFS causes such severe tiredness, but researchers think it may involve infections, immune system problems, stress, or changes in how your body's cells make energy. It might take more than one thing working together to cause the illness.

  • Will stress make my symptoms worse?
    MedlinePlusMay 2026

    Yes, physical or emotional stress is one of the possible triggers that researchers are studying as a cause of ME/CFS, so managing stress may help you feel better.

  • How does this illness affect my daily life?
    MedlinePlusMay 2026

    ME/CFS can make you unable to do your usual activities—some people can't work, exercise, or do daily tasks like cooking or cleaning without feeling much worse afterward.

  • Will I always have to limit my activities?
    MedlinePlusMay 2026

    Many people with ME/CFS need to limit their activities to manage their symptoms, but how much you need to limit activities depends on how severe your illness is and how you respond to treatment.