Leukemia questions?

So I'm writing a story about a 15 year old boy who gets diagnosed with leukemia how realistic would these be as the symptoms he has before being diagnosed? - he's really pale - he's tired a lot - he needs to rest after doing almost anything( for example needing to sit down after walking up stairs or... show more So I'm writing a story about a 15 year old boy who gets diagnosed with leukemia how realistic would these be as the symptoms he has before being diagnosed?

- he's really pale
- he's tired a lot
- he needs to rest after doing almost anything( for example needing to sit down after walking up stairs or resting after doing a simple task like making the bed)
Update: But I've never posted this question before
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