10 Signs You Could Have Leukemia and Not Know It

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It's surprisingly common not to know you have leukemia -- an insidious cancer of the blood and bone marrow -- until it turns up in a routine blood test. And because early diagnosis is critical to successful treatment, it's important to know these ten common, easily missed signs:

1. Purplish patches or tiny red spots on the skin

Known as petechiae, these tiny red or purple spots often appear in clusters -- typically on the chest, back, face, or arms -- and are a side effect of the blood's failure to clot. They may be confused with a rash, although they're really broken blood vessels and capillaries resulting from low platelet count.