The main causes of increased white blood cells inside the blood routine are: 1, infection, bacterial infection can cause elevated white blood cells afterwards, patients can have fever, cough, cough, urinary frequency, urinary urgency, painful urination and other symptoms of infection. The patient may have symptoms of infection such as fever, cough, sputum, frequent urination, urgency, painful urination, etc. Sensitive antibiotics can be given for antibacterial treatment, and the white blood cell count can drop when the infection is controlled.2. Commonly seen in tissue necrosis, such as acute myocardial infarction, acute pulmonary tamponade, massive burns, trauma, and elevated white blood cell counts after major surgery.3. Patients who use glucocorticoids for a long time may also have elevated white blood cells.4. Blood system diseases, such as acute leukemia, chronic leukemia, bone marrow The early stage of myelodysplastic syndrome and myelofibrosis may also result in elevated white blood cell counts.