In the early stages of adult leukemia, it is due to the rapid proliferation of malignant tumor cells, which leads to the reduction of the three blood lineages, resulting in manifestations related to anemia, infection, and bleeding. In addition, the manifestations related to leukocyte proliferation and infiltration can also appear. 1. Anemia, hemorrhage, infection: it mainly includes dizziness, weakness, headache, decreased activity endurance, dyspnea after activity, and so on. Bleeding symptoms are mainly manifested as petechiae and ecchymosis of the skin, nosebleed, gum bleed, menorrhagia, intracranial hemorrhage, DIC and so on. Infection mainly manifests as fever, sore throat, pneumonia and so on. 2. Leukocyte proliferation and infiltration: gingival hyperplasia, swelling, enlarged lymph nodes and so on. The symptoms of leukemia in the early stage are not specific and typical, and it is difficult to recognize them in time. Therefore, when we feel unwell, we should not delay for a long time, and we should consult a doctor in time to find out the cause of the disease and then treat it under the guidance of a physician.