Acute leukemia is a type of cancer affecting the blood and bone marrow, characterized by an abnormal increase in white blood cells. Symptoms include fever, loss of appetite, bruising, and bone or joint pain. Risk factors include genetic diseases, smoking, and Down syndrome. Treatments involve chemotherapy, radiation therapy, and addressing symptoms. The chances for cure are good, especially in children, though prevention is not possible and it can affect adults over 65 as well.