Who is at risk? / Types

Blood cancer or Leukaemia is actually a group of diseases, each of which impede with the normal functioning of blood cells and progressively weaken the system.
Depending on the type of blood cell involved, Leukaemia can be Lymphocytic or Myelogenous. Depending on the pace with which the disease progresses leukaemia is classified as either Acute or Chronic. Thus we have:
Acute Lymphocytic Leukaemia (ALL): Lymphoid cells are affected. Disease progresses quickly. This is most common among children.
Chronic Lymphocytic Leukaemia (CLL): Lymphoid cells are affected. Disease progresses over a long period. Usually affects adults, more men than women.
Acute Myelogenous Leukaemia (AML): Myeloid cells are affected. Disease progresses quickly. AML occurs in both children and adults.
Chronic Myelogenous Leukaemia (CML): Myeloid cells are affected. Disease progresses over a long period of time. More common among adults.