I am 15 and think I have leukemia i have been in for routine blood test however they come back normal. I am constantly tired, short of breath, get dizzy easily, sometimes bruise for no apparent reason, and my gums sometimes bleed. I also have swollen lymph nodes by jaw and at the back of the neck, that haven't gone away in 3+ years, i was tested for low iron which came back negative so does anyone know why I am having these symptoms of leukemia in children, from my research i find leukemia, but if I have leukemia why are the tests coming back negative? What are possible other diagnosis's. Thanks, let me know your thoughts!