Leukemia is cancer that develops in the bone marrow, lymphatic system or other blood-forming tissues, causing a large amount of cancerous cells to spread through the bloodstream. Symptoms include bruising, bleeding, lethargy, fever, anemia and increased risk of infections. Leukemia is generally categorized into four groups: acute lymphocytic leukemia (ALL), chronic lymphocytic leukemia (CLL), acute myeloid leukemia (AML) and chronic myeloid leukemia (CML). CML, CLL and AML are more common in men than women.
Learn more about leukemia