Leukemia, also called blood cancer, is a malignant tumor of the blood system that poses a great threat to people’s health. The early symptoms of leukemia include: a. Anemia symptoms. In the early stage of leukemia patients, they will have a series of anemia symptoms such as pale face, dizziness, weakness, panic, chest tightness, laziness, etc. The symptoms may be mild at the beginning, but as the disease progresses, the anemia symptoms will become more and more obvious. Second, the symptoms of infection. About half of the patients will have fever, which can be similar to a cold or high fever, manifested as a body temperature over 39 degrees, accompanied by chills and excessive sweating, etc. The site of infection is common with pneumonia, oral infection and perianal infection. Third, bleeding symptoms. Some patients will have bleeding spots on the skin mucosa, which are pinpoint bleeding spots, and sometimes bleeding from the nose and gums. Fourth, local organ infiltration symptoms. Some leukemia patients will have swollen lymph nodes in the neck, armpit, groin and other areas. Therefore, if there is anemia, infection, bleeding, and swollen lymph nodes, you should be alert to the presence of acute leukemia and go to the hematology department for examination.