Recurrent low-grade fever with normal blood counts may be due to hyperthyroidism, Mycobacterium tuberculosis infection etc. Usually, general treatment as well as medication can be used. 1. Hyperthyroidism: If the thyroid gland is hyperfunctional, the basic metabolic rate of the body will be accelerated after the disease, which can cause the phenomenon of repeated low fever. And the disease usually does not appear blood abnormalities. You can use propylthiouracil tablets to treat hyperthyroidism by inhibiting the thyroid gland from synthesizing hormones, thus relieving the phenomenon of repeated low fever and normal blood counts. 2. Tuberculosis infection: tuberculosis is a pathogenic bacteria, can cause inflammatory reaction and metamorphosis in the body, can lead to increased body temperature, blood routine is generally normal, so it will be repeated low fever blood routine normal phenomenon, you can use isoniazid tablets for the treatment of synthetic antimicrobial drugs with bactericidal effect, so as to alleviate the phenomenon of repeated low fever blood routine normal phenomenon. If the patient has been repeated low fever blood normal, after excluding physiological factors, it is recommended to consult a doctor in a timely manner, after a clear examination targeted treatment.