White blood cells of more than 20,000 can not be generalized, and need to be based on other indicators and personal specific circumstances of a comprehensive analysis. High white blood cells are mostly caused by bacterial infections, such as purulent tonsillitis, white blood cells can reach more than 20,000, which does not mean that there is a danger. In newborns, 20,000 white blood cells are also within the normal range. However, if you are suffering from bacterial meningitis, appendicitis, severe pneumonia and other diseases, white blood cells over 20,000 is more serious, there is a certain degree of danger, and need to actively receive treatment. In addition to this, 20,000+ white blood cells also need to be alerted to the possibility of malignant diseases of the blood system, which is also more dangerous. Therefore, when the test report suggests that the white blood cells are more than 20,000, you should ask your doctor in time, and the doctor will combine other test indicators and specific conditions to make a comprehensive judgment, and receive standardized treatment under the guidance of the doctor.