Which of the following is a sign of sinusitis, especially when accompanied by fever?

Facial pressure and pain are common signs of sinusitis, particularly when associated with fever. Sinusitis is an inflammation of the sinus cavities, which can lead to symptoms caused by the accumulation of mucus and increased pressure in the affected areas. This pressure often manifests as discomfort or pain in the face, particularly around the forehead, cheeks, and eyes. The presence of fever further indicates an infectious process, which is frequently the underlying cause of sinusitis.

Other symptoms like nasal polyps, Eustachian tube dysfunction, and allergy symptoms, while they can be related to sinus issues, do not specifically point to sinusitis with concurrent fever. Nasal polyps are growths that can occur in the nasal passages, but they are not a direct symptom of sinusitis. Eustachian tube dysfunction refers to issues with the tube that helps equalize pressure in the ear, and although it can occur alongside sinus problems, it is not a direct indicator of sinusitis. Allergy symptoms can mimic some aspects of sinusitis but do not typically involve fever unless there is a secondary infection. Thus, facial pressure and pain stand out as particularly indicative of sinusitis in this context.