Early stages of leukemia often show no symptoms, but as the cancer progresses, symptoms become more pronounced. Symptoms vary from person to person, but some of the more common symptoms of leukemia are:
fever,
night sweats,
frequent infections,
weakness,
fatigue,
headaches,
easy bruising,
bone pain,
pain in the joints,
swelling of the abdomen,
swollen lymph nodes, especially in the neck and armpits,
weight loss.
A combination of a physical exam, blood tests and a biopsy enables the doctor to properly diagnose leukemia. Do you know if he has had blood tests like a CBC? In leukemia his PLTs, WBC and RBC should be out of whack. See if you can find that out.
Kids do get infections and bruises. Some more than others.
Let us know what you find.