Elderly leukemia is usually caused by viral infection, heredity, bad life habits, etc. Clinically, it can be divided into acute leukemia and chronic leukemia, with different clinical symptoms of different nature. 1. Acute leukemia: patients may suddenly develop high fever and severe bleeding in the early stage, with the development of the disease, patients will develop moderate to severe anemia, bleeding from the gums, nasal cavity, intracranial, gastrointestinal tract, urinary tract, etc. Bleeding may also occur, and patients may also develop blindness, protruding eyeballs and other symptoms, and the central nervous system will develop headache, blurred vision, convulsions and other symptoms. 2. Chronic leukemia: Chronic leukemia is generally divided into chronic myeloid leukemia and chronic lymphocytic leukemia. Chronic myeloid leukemia patients mainly show symptoms such as weight loss, enlarged spleen, fatigue, sweating, etc. Chronic lymphocytic leukemia patients usually have no conscious symptoms, and they may have fatigue and tiredness in the early stage, and with the development of the disease, the patients may have night sweating, loss of appetite, low-grade fever and so on. If the above symptoms occur, you should go to the hospital in time to seek medical treatment, and under the guidance of the doctor after diagnosis.