The causes of normal blood test but with fever may include viral infection, tuberculosis, absorption fever, central fever, etc. It can also be seen in early acute leukemia and so on.
1. When the human body is infected with influenza virus and many other viruses, viral colds can occur, often accompanied by chills, fever, muscle aches, runny nose, sore throat and other symptoms, but blood tests are normal. Because viral infections often rarely result in elevated white blood cells, some patients may have a mild decrease in lymphocytes.
Calcitoninogen, C-reactive protein and other tests in patients with viral infection are not obviously elevated, while serum amyloid A can be seen to rise, need to be antiviral treatment, such as oseltamivir.
2. When tuberculosis occurs in human body, such as pulmonary tuberculosis, there may be night sweats, afternoon low fever, fatigue, emaciation, etc., and some patients may also have high fever. The blood test of such patients can be normal, and they need to be treated with active anti-tuberculosis treatment, such as isoniazid and rifampicin.
3. Absorption fever refers to the fever caused by the absorption of sterile necrotic material, which can be seen in tissue injury after major surgery, internal hemorrhage, extensive burns, infarction of organs or necrosis of limbs (splenic infarction, myocardial infarction), etc.; after the absorption of these damaged tissues is completed, the symptoms of fever will disappear.
4. Central fever refers to fever caused by abnormalities in the thermoregulatory center due to lesions in the central nervous system. For example, when cerebral hemorrhage, epilepsy and other diseases occur.
5. Early acute myeloid leukemia can also cause fever, but at this time the blood routine can still be within the normal range.
It is recommended that the patient go to the hospital in time to clarify the specific cause of the disease and treat the cause of the disease.