Facial sinuses are air-filled spaces located within the bones of the face. They are part of the paranasal sinuses system, which includes the maxillary, frontal, ethmoid, and sphenoid sinuses. These cavities help to lighten the weight of the skull, improve voice resonance, and produce mucus that keeps the nasal passages moist. The facial sinuses are lined with a mucous membrane that can become inflamed due to infections or allergies, leading to conditions like sinusitis. This inflammation can cause symptoms such as facial pain, congestion, and headaches, affecting overall comfort and health.