Leukemia, also known as blood cancer, is a malignant tumor of the hematopoietic system. The origin of the disease is the abnormal working of the hematopoietic tissue in the bone marrow due to mutations in the intracellular deoxyribonucleic acid. The stem cells in the bone marrow can produce thousands of red blood cells and white blood cells every day. Patients with leukemia overproduce immature white blood cells, which interferes with the other work of the bone marrow, and this reduces the bone marrow’s ability to produce other blood cells. Leukemia can spread to the lymph nodes, spleen, liver, central nervous system and other organs. Leukemia is the number one malignant disease in young people.