Final answer:
Acute lymphoblastic leukemia (ALL) is a cancer of the blood and bone marrow characterized by an overproduction of immature white blood cells, more common in children, leading to symptoms such as fatigue, easy bruising, and frequent infections.
Step-by-step explanation:
Acute lymphoblastic leukemia (ALL) is a type of cancer that affects the blood and bone marrow. It is indeed more common in children than in adults, making it a significant pediatric concern.
ALL is characterized by the overproduction of immature white blood cells, which impairs the body's ability to fight off infections and perform other critical functions of the immune system. As a result of the disruption in normal blood cell production, individuals with ALL may experience symptoms such as fatigue, easy bruising, and frequent infections due to the compromised immune system.