What happens if chronic fatigue syndrome is not treated?

Chronic fatigue syndrome can involve marked fatigue, poor-quality sleep, difficulty thinking and a delayed worsening of symptoms after physical or mental effort. Without an individual plan, repeated overexertion may lead to longer periods of reduced activity and make work, study, self-care and social contact more difficult. Low mood can develop in response to prolonged limitations, although it is not the same as the underlying illness. Other causes of fatigue, including glandular fever or anaemia, may need consideration.

Arrange a GP consultation for a full history, examination and review of sleep, medicines and activity patterns. A blood test may help check for other explanations when clinically appropriate. Keep an activity and symptom diary, plan rest before exhaustion, and avoid forcing increases that trigger a delayed crash. Ask for help with practical tasks and discuss adjustments at work or school.

Seek prompt care if your ability to eat, drink, wash or move changes noticeably, or if symptoms suddenly become much worse. Get urgent help for chest pain, severe breathing difficulty, fainting, new weakness, confusion or thoughts of self-harm. A new pattern should be reviewed rather than attributed automatically to chronic fatigue syndrome.

Ask how the diagnosis is being assessed, which tests are appropriate, how to recognise post-exertional worsening and what support may protect your daily function. Discuss sleep, pain, mood and workplace or study adjustments.