Cancer related fatigue differs from common tiredness as it has no precise cause and effect. Whilst everyone can get tired after activity or a full day, this type of fatigue is not related to activity nor gets better after rest or sleep. It is an unusual full body tiredness which is not relieved by sleep and occurs throughout the day. It is a constant, prolonged and extreme lack of energy where normal day-to-day activities are challenging and even the arms and legs can feel heavy and hard to move. A cancer may cause fatigue as the cancer cells use up the body’s energy supply and change the way the body makes energy from food. It is a common early symptom in some cancers like leukemia or stomach or colon cancers where blood loss occurs but is not obvious and will cause fatigue.
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