What Fatigue Is And Is Not

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Fatigue is a subjective condition for which there is no test.

When we get tired, our bodies need to rest. Generally, after a rest such as a good night's sleep, we feel refreshed.

With fatigue, you can get a good night's sleep and still wake up feeling exhausted. The feeling of exhaustion does not relate to physical activity or emotional stress.

Fatigue frequently includes the following:

You lack the strength to do the everyday things you used to do.
You feel weak and tired more quickly than usual.
You feel dizzy after walking short distances or climbing stairs.
Simple tasks leave you short-of-breath.
You experience feelings of sadness, frustration, irritability or hopelessness.
A diminished interest in life.
You find it difficult to concentrate or focus your attention. ("Attentional fatigue.")

Fatigue does not have set patterns. It is dynamic. Fatigue waxes and wanes over time -- perhaps even on a daily basis.