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The main symptoms of ALL are caused by the increased number of immature cells (blast cells) in the blood, which reduces the number of normal blood cells.
Occasionally, a person will not have any of these symptoms and the leukaemia is discovered during a routine blood test.
Symptoms may appear very quickly over a few weeks, and treatment| needs to be given as soon as possible. If you have any of these symptoms you should have them checked by your doctor, but remember they are common to many illnesses other than leukaemia.
Content last reviewed: 1 July 2011
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