The onset and progression of Acute Lymphoblastic Leukemia (ALL) are a result of sequential genetic mutations that alter cellular functions. These mutations halt the development of lymphoblasts, which are precursor lymphocytes, and confer upon them an uncontrolled proliferative capacity. This excessive proliferation subsequently inhibits the production of healthy blood cells in the bone marrow.

Known causes and risk factors for Acute Lymphoblastic Leukemia (ALL) include:

* While factors such as exposure to ionizing radiation, certain chemicals, and past viral infections are thought to play a role in ALL development, a single, definitively proven cause for the disease has not yet been identified.
* Rare cases of familial transmission of ALL have been reported.
* Infants born with high birth weight have an increased risk of developing ALL within the first five years of life.
* Individuals with Down syndrome also exhibit an elevated risk of ALL development.