There are various reasons for a high basophil percentage in patients. If it is mildly high and the patient does not show any abnormalities, it is considered to be probably normal and there is no need to worry too much. The influence of exercise and external environment on the test results cannot be ruled out. If it is obviously high, we need to pay attention to the pathological status: 1, drug stimulation: patients taking isoniazid, minocycline, quinidine and other drugs for a long time, sometimes the basophil percentage is high; 2, allergic diseases: inhalation of dust mites, dust, animal dander and other allergens, as well as moldy and spoiled food, causing allergic colitis, allergic gastritis, allergic rhinitis, allergic asthma, etc., basophil Percentage will be high; 3. Blood diseases: chronic granulocytic leukemia, increased bone marrow promyelocytes, differentiation into basophils also increased accordingly. Rarely, basophilic leukemia may show a significant increase in the percentage of basophils. High basophil percentage can be seen in myeloproliferative disorders and myelofibrosis; 4. Infectious diseases: chickenpox, influenza, smallpox, tuberculosis, etc. Some patients may have high basophil percentage; 5. Others: diabetes, malignant tumor metastasis, post-splenectomy, heavy metal poisoning, etc. may also have high basophil percentage. Therefore, if a patient has such a condition, he or she needs to identify the cause in a timely manner in conjunction with clinical symptoms to avoid delaying the condition.