Fever for several months can not find out the cause, may be related to special pathogens infection, oncological diseases, autoimmune diseases and so on.
1. Special pathogen infection: such as tuberculosis, some patients with tuberculosis may not necessarily be tuberculosis, but may also be other parts of the tuberculosis, clinical symptoms are not typical, the patient may be recurrent fever, which leads to fever for several months can not be found.
In addition, some special bacteria, such as Nocardia; some special fungi, such as Actinomyces; and some viruses, such as EBV. Infection can also cause fever for several months without finding out the cause.
2. Tumor diseases: such as lymphoma, lung cancer, etc., tumor cell necrosis can easily cause recurrent fever in human body. In the early stage of the disease, when the symptoms are not typical and the examination results are not typical, the cause may not be found out.
3. Autoimmune diseases: for example, autoimmune hepatitis, systemic lupus erythematosus and so on, mostly due to immune system diseases. This kind of patients can appear the phenomenon of recurrent fever, but in the early stage of the disease, the symptoms are not typical, and the test results are not typical, you may not be able to find the specific cause.
Fever for several months can not find the cause of a variety of other possible causes, should be further under the guidance of the doctor to improve the examination, to clarify the cause of the disease, and targeted treatment.