Allergic rhinitis generally rarely involves a fever. This is because the main pathogenic mechanism of allergic rhinitis is exposure to allergens, which triggers the body's autoimmune response, leading to common clinical symptoms such as itchy nose, clear nasal discharge, and sneezing, and it may persistently recur. However, overall, it is caused by the body's immune allergic response, without obvious acute bacterial or viral infection, so the likelihood of causing a fever is small. Therefore, in terms of treatment, if there is a fever, it is necessary to investigate whether there is an acute viral or bacterial infection. This can be done by observing clinical symptoms, examining the conditions inside the nasal cavity, and combining this with routine blood tests, which essentially can confirm and determine the diagnosis.