The types of leukemia can be grouped based on how quickly the disease develops and gets worse.

•  Chronic leukemia

Early in the disease, the leukemia cells can still do some of the work of normal white blood cells. People may not have any symptoms at first. Doctors often find chronic leukemia during a routine checkup. Slowly chronic leukemia gets worse. As the number of leukemia cells in the blood increases, people get symptoms such as swollen lymph nodes   or infections. When symptoms do appear, they are usually mild at first and get worse gradually

• Acute leukemia

The leukemia cells can’t do any of the work of normal white blood cells. The number of leukemia cells increase rapidly. Acute leukemia usually worsens quickly.

The type of leukemia also can be grouped based on the type of white blood cell that is affected. Leukemia can start in lymphoid cells or myeloid cells. There are four common types of leukemia.

•  Chronic  lymphocytic (CLL)

CLL affects lymphoid cells and usually grows slowly. It accounts for more than 15K new cases of leukemia each year. Most often, people diagnosed with the disease are over age 55. It almost never affects children.

•  Chronic myeloid leukemia (CML)

CML affects myeloid cells and usually grow slowly at first. It accounts for nearly 6K new cases of leukemia each year. It mainly affects adults.

•  Acute lymphocytic [lymphoblastic] leukemia (ALL)

ALL affects lymphoid cells and grows quickly. It accounts for more 6K new cases of leukemia each year. ALL is the most common type of leukemia in young children. It also affects adults.

•  Acute myeloid leukemia (AML)

AML affects myeloid cells and grows quickly. It accounts for more than 18K new cases of leukemia each year. It occurs in both adults and children

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