Below is an instruction from Human. Write a response.
    ### Instruction:
    What are the symptoms of Leukemia ?
    ### Response:
    During the early stages of leukemia, there may be no symptoms. Many of the symptoms of leukemia don't become apparent until a large number of normal blood cells are crowded out by leukemia cells. Symptoms of Chronic and Acute Leukemia In chronic leukemia, symptoms develop gradually and, in the beginning, are generally not as severe as in acute leukemia.
    