Recurrent fever is not necessarily due to leukemia, but can also be caused by other diseases, so a clear diagnosis and symptomatic treatment are needed. Leukemia is a class of malignant clonal diseases of hematopoietic stem cells. Because patients have a lack of granulocytes and decreased immune function, they often have combined infections, such as coughing, coughing up sputum and hemoptysis, and will have recurrent fever and persistent high fever, mostly irregular fever. However, if there are recurrent fevers, they are not always caused by leukemia. There are many diseases that can cause recurrent fevers, such as influenza, bacterial pneumonia, tuberculosis, typhoid, malaria, and dengue fever. In addition, recurrent fever may be caused by recurrent respiratory infections due to low immune function. If you suspect that you have leukemia, you should visit the hematology department of a hospital for routine blood tests, bone marrow biopsy and blood biochemistry tests to clarify the diagnosis and provide reasonable treatment.