Low eosinophil percentage is not necessarily cancer. The causes of low eosinophil percentage include physiological factors, infection, surgery, burns and so on. 1. Physiological factors: Normal people’s eosinophils are lower in the daytime and higher at night. It fluctuates more in the morning and is more constant in the afternoon. In labor, cold, hunger, mental stimulation, etc., can lead to a decrease in eosinophils in the peripheral blood. 2. Infection: such as typhoid infection, due to the inhibitory effect of endotoxin, granulocyte destruction increases, coupled with monocyte-macrophage proliferation in the bone marrow, the granulocyte system is severely inhibited, resulting in a significant reduction in peripheral blood eosinophils. 3. Long-term application of adrenocorticotropic hormone therapy: long-term application of hormone drugs such as prednisone, etc., the bone marrow hematopoietic function can be inhibited, and peripheral blood eosinophils are reduced. 4. Surgery, burns: when stress occurs in the body, it will also reduce eosinophils, such as surgery, burns and so on. Eosinophilia alone can not accurately determine the cause, but also need to be combined with the characteristics of the medical history, other test results to make an accurate judgment, it is recommended to clarify the cause of the disease under the guidance of the doctor and receive treatment.