What are the first signs of chronic fatigue syndrome?

The fatigue is more than ordinary tiredness: rest may not restore your usual function, and everyday tasks can require unusual effort. Post-exertional worsening may appear after activity rather than during it, with symptoms lasting beyond the activity itself.

Sleep may feel unrefreshing, while concentration, memory, pain, headaches, sore throat, tender glands, or dizziness can also occur. These features overlap with infections, anaemia, thyroid problems, low mood, and other conditions, so one symptom cannot establish the diagnosis.

Arrange a GP consultation when fatigue is persistent, changes your ability to work or study, or repeatedly worsens after exertion. Keep a simple record of activity, sleep, symptoms, and recovery time; this can reveal patterns without pushing through exhaustion.

A clinician may review your history, examine you, and use blood tests to look for other explanations. Avoid suddenly increasing exercise while symptoms are unstable. Plan activity within your current limits and discuss pacing and practical support.

Seek urgent help for chest pain, severe breathlessness, fainting, new confusion, one-sided weakness, or thoughts of harming yourself. Arrange prompt medical review for rapidly worsening fatigue, persistent fever, unexplained bleeding, or inability to keep fluids down.

Ask which conditions should be checked, whether a blood test is appropriate, how to manage post-exertional worsening, and what support is available for work, study, sleep, mood, and daily activities. Bring your symptom and activity record.