What is the most common type of leukemia?

Chronic lymphoid leukemia (CLL) is the most common type of leukemia, particularly among adults. CLL originates in the bone marrow and is characterized by an overproduction of B lymphocytes, a type of white blood cell that plays a crucial role in the immune response. This accumulation of abnormal B cells can lead to a variety of symptoms, such as fatigue, swollen lymph nodes, and increased susceptibility to infections.

The reason CLL is considered the most prevalent form of leukemia is due to its relatively high incidence in the adult population compared to other forms. It typically manifests slowly over time, often diagnosed in older adults, and its prevalence reflects changes in demographic factors, including an aging population.

In contrast, acute myeloid leukemia (AML), acute lymphoblastic leukemia (ALL), and chronic myeloid leukemia (CML) have distinct characteristics and are less common than CLL. AML and ALL are more prevalent in children, while CML is a less frequently diagnosed form of leukemia that primarily affects adults.