SINUSIT - acute or chronic inflammation of the paranasal sinuses. It can be one- or two-sided involving any sinus or all paranasal sinuses on one or both sides (the so-called pansinusitis). Often there is a defeat of the maxillary sinus - sinusitis , followed by ethmoiditis , frontal sinusitis and sphenoiditis. Prevention of sinusitis should be aimed at treating the underlying disease (influenza, acute rhinitis , measles , scarlet fever and other infectious diseases, caries and other dental injuries), eliminating predisposing factors (curvature of the nasal septum, etc.). An important role is played by hardening of the body.