Final answer:
Leukemia is a malignant disease of the blood characterized by the uncontrolled accumulation of immature leukocytes. It affects the normal functioning of white blood cells and can lead to serious health issues. Various treatments are available which can improve prognosis.
Step-by-step explanation:
Leukemia is a malignant disease of blood-forming tissues characterized by uncontrolled production and accumulation of immature leukocytes, also known as white blood cells. It is a type of blood cancer that can be classified into various forms, including myelocytic leukemia and lymphocytic leukemia, depending on the type of leukocyte involved. In chronic leukemia, mature leukocytes accumulate and fail to undergo the normal process of cell death. In contrast, acute leukemia is associated with an overproduction of young, immature leukocytes. Both conditions interfere with the normal functioning of the blood cells, leading to symptoms such as excessive bleeding, bruising, fatigue, fever, and an increased risk of infections. Treatment options are available, and they can extend life and even potentially cure the disease in some cases.