The causes of recurrent fever without high blood test are considered as tumor fever, viral infection, Mycobacterium tuberculosis infection and so on. 1. Tumor diseases can sometimes lead to recurrent fever symptoms, this kind of fever is generally normal in patients’ blood test (routine blood test), this kind of elevated temperature can be restored to normal with the effective control of tumor diseases, the specific cause of tumor fever is not clear yet. 2. Clinical infections caused by viruses attacking the human body will often cause recurrent fever, and many patients will have normal blood test. 3. Some special types of bacterial infections occur in the human body, and there will also be recurrent fever with low blood count, such as tuberculosis caused by tuberculosis bacilli. There may be other reasons for recurrent fevers without high blood counts, so it is recommended that you go to the hospital in time to complete the relevant examinations, identify the cause of the disease, and then give targeted treatment.