High blood pressure in fever is mostly indicative of elevated inflammatory indicators, and blood tests are performed when fever first appears. The results of the examination reveal inflammatory indicators, including elevated neutrophils, lymphocytes and total white blood cells, which in most cases indicate the presence of a corresponding pathogenic infection in the organism, clinically referred to as elevated blood picture. When clinically significant blood abnormalities are present, a systematic examination should be performed, especially to target the cause of fever. Changes in the blood picture are important in determining the severity of the disease and the response to treatment. Therefore, when clinical symptoms of fever appear, a timely evaluation of blood count should be given, and a systematic assessment and evaluation of the disease judgment should be made based on the changes in blood count, so that clinical treatment can be guided.