Swollen lymph nodes and fever may be inflammation of some lymph nodes, and it is important to see which lymph nodes are in which area. If the lymph nodes are in the neck, look at the redness of the throat, whether there is pharyngitis, whether there is tonsillitis, it is best to check a routine blood test to see if there is a significant increase in C-reactive protein and lymphocytes, and white blood cells. If these conditions are normal, it may be a viral infection. If there are problems with these conditions or if the lymphocytes are significantly elevated and there is purulent discharge from the tonsils, you should also be alert for EBV infection. Of course certain hematologic diseases such as lymphoma and leukemia may also manifest as enlarged lymph nodes with fever and require lymph node biopsy and bone marrow aspiration for a clear diagnosis. Therefore, for simple swollen lymph nodes and fever, some auxiliary tests are needed to make a clear diagnosis.