The symptoms of leukemia are mainly related to the destruction of the hematopoietic function in the bone marrow. Symptoms caused by destruction of the hematopoietic function of the bone marrow are prone to bruising, swelling and spot bleeding. Platelet deficiency is caused by a decrease in the number of megakaryocytes that make platelets. Leukemia is a group of malignant clonal diseases of hematopoietic stem cells. Clonal leukemia cells accumulate in the bone marrow and other hematopoietic tissues due to mechanisms such as uncontrolled proliferation, impaired differentiation, and impaired apoptosis, and infiltrate other tissues and organs while normal hematopoiesis is suppressed. Clinically, varying degrees of anemia, bleeding, infectious fever, and enlargement of liver, spleen, lymph nodes and skeletal pain are seen. So what are the causes that predispose to cyanosis? Leukemia Leukemia is a group of clonal malignant diseases with abnormal hematopoietic stem cells. The leukemic cells in its clones lose the ability to differentiate and mature further and stagnate at different stages of cell development. Leukemia cells proliferate and accumulate in the bone marrow and other hematopoietic tissues and infiltrate other organs and tissues, while suppressing normal hematopoiesis, with clinical manifestations of anemia, bleeding, infection and infiltration of various organs. Secondary leukemia Secondary leukemia (secondary leukemia) is a recognizable subtype of acute leukemia secondary to chemotherapy, radiation therapy or a definite history of environmental or occupational exposure to acute leukemia. Acute leukemia Acute leukemia is a malignant transformation of one or more hematopoietic stem and progenitor cells, which lose their normal ability to proliferate, differentiate and mature and continue to proliferate without control, gradually replacing the bone marrow and infiltrating through the bloodstream to tissues and organs throughout the body. It is a malignant tumor of hematopoietic tissue, commonly known as blood cancer. Acute myelocytic leukemia (AML) or acute non-lymphoblastic leukemia (ANLL) includes all acute leukemias of non-lymphoblastic origin.