Leukemia is a type of cancer that affects the blood and bone marrow, which is a tissue responsible for producing blood cells. Leukemia starts in the cells of the bone marrow and spreads into the bloodstream. It disrupts the production and function of healthy blood cells. It can develop slowly or progress slowly over time, depending on the type. Here, we’ll understand what is leukemia, its signs and symptoms, its causes and risk factors, diagnosis, and treatment options.