There are three types of granulocytes, including neutrophils, eosinophils and basophils. The normal range for neutrophils is 50%-70%. Increased neutrophils are common in acute infections, acute tissue injury or acute poisoning, and decreased neutrophil counts are common in viral infections or bone marrow damage caused by radiotherapy. The normal range of eosinophils is 0.5%-5%. Eosinophilia is common in allergic diseases such as allergic asthma, urticaria, food allergy, etc. Also parasitic infections such as ascariasis, hookworm disease, etc., may also present with eosinophilia. The normal range of eosinophilia is 0-1%. Eosinophilia is commonly caused by allergic diseases, such as allergic enteritis and allergies to drugs and food. In addition, the percentage of basophils is also increased in certain malignant tumors.