Herpes pharyngitis is mostly caused by herpes viruses, and the fever of herpes pharyngitis may not go down because of wrong medication, low dose, etc. If there are some complications such as myocarditis, encephalitis, etc. may also cause fever. 1. Incorrect medication: If the patient’s resistance is weak, there may be secondary bacterial infections during the course of the disease, in which case the fever may not subside if the herpes pharyngitis patient simply uses antiviral medication. 2. Small dosage: If the dosage used is insufficient, it will also affect the efficacy of the drug and may lead to non-reduction of fever. It is recommended to take the medication scientifically under the guidance of a doctor. 3. Complications: If herpes pharyngitis is combined with other diseases such as encephalitis or myocarditis, the fever may also not go down. There may be other reasons why the fever of herpetic pharyngitis does not return, it is recommended to go to the hospital in time, improve the examination to clarify the cause of the disease, and then give targeted treatment or therapy.