Sinusitis may cause fever, but this is mainly seen in acute sinusitis or during the acute flare-ups of chronic sinusitis, which relatively tends to provoke a fever. If it is just a mild case of sinusitis or plain chronic sinusitis, most patients do not experience significant fever changes, but they might have symptoms like nasal congestion, runny nose, headaches, dizziness, and a decrease in the sense of smell. When experiencing a fever, it is important to visit an otolaryngology department as soon as possible where you might consider undergoing a routine blood test to check the extent of the inflammatory response. Most patients will need to consider antibiotic treatment for the infection. If the body temperature exceeds 38.5 degrees Celsius, there may be a need to consider antipyretic medications. If the fever is below 38.5 degrees, physical cooling measures are generally recommended, but it is necessary to regularly reassess and monitor the temperature, selecting targeted treatments based on the fluctuations of the condition. (The use of medications should be under the guidance of a doctor.)