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The main symptom of CFS/ME is feeling extremely tired and generally unwell.

Symptoms vary from person to person, and the severity of symptoms can vary from day to day, or even within a day. 

The main symptom of CFS/ME is extreme physical and mental tiredness (fatigue) that does not go away with rest or sleep. This can make it difficult to carry out everyday tasks and activities.

Most people with CFS/ME describe their fatigue as overwhelming and a different type of tiredness from what they've experienced before.

Other symptoms of CFS/ME include:

Exercising usually makes the symptoms of CFS/ME worse. Sometimes the effect is delayed and you'll feel very tired a few hours after you've exercised, or even the next day.

Most cases of CFS/ME are mild or moderate, but up to 1 in 4 people have severe symptoms. If your symptoms are severe, a specialist should be involved in your treatment.

CFS/ME symptoms can be considered:

There may be times when your symptoms get worse. These periods are known as setbacks or relapses.

The symptoms of CFS/ME are similar to those of other conditions, including postural tachycardia syndrome (PoTS), where you have an abnormal increase in heart rate after sitting or standing up, which can cause dizziness, fainting and other symptoms.

If you think you may have CFS/ME, it's important to see a GP to make sure you get a correct diagnosis.