Normal blood picture but fever is very common in clinical practice, and the common causes are: i. Normal blood picture but fever can occur with certain viral infections, such as influenza virus, respiratory virus, and enterovirus infections may appear with normal blood picture but fever. Second, certain gram-staining negative bacillus infections may also appear with normal blood picture but normal body temperature, such as typhoid fever, typhus infection, etc. may appear with normal blood picture but with recurrent fever. Certain tumor diseases may also appear with normal blood picture but fever, this fever is called tumor fever. 4. Some patients with chronic anemia, especially younger patients with chronic anemia, may have chronic fever caused by anemia due to the imperfect development of the body temperature center, but the blood picture is not high in routine blood tests.