Sinusitis can cause fever, but it is mostly seen in acute sinusitis. Sinusitis is a sinus infection caused by viruses, bacteria or fungi and is categorized into acute sinusitis and chronic sinusitis. Acute sinusitis can be subdivided into acute viral sinusitis, acute post viral sinusitis, and acute bacterial sinusitis. Acute sinusitis may present with systemic symptoms such as fever, chills, constipation, loss of appetite, and local symptoms such as nasal congestion, pus, loss of smell, and pain in the cheeks. Chronic sinusitis mostly comes from repeated episodes of acute sinusitis, usually there is no symptom of fever, manifested as nasal congestion, pus and runny nose, etc., and may appear mental depression, dizziness and headache, memory and concentration loss and other systemic symptoms. If there are fever, nasal congestion worsening and other uncomfortable symptoms, it is necessary to go to the hospital in a timely manner for formal treatment.