This study provides a comprehensive overview of sinusitis, detailing its pathophysiology, clinical manifestations, diagnostic criteria, and management strategies. Sinusitis, characterized by inflammation of the paranasal sinuses, can be acute, subacute, recurrent, or chronic, with distinct clinical presentations and treatment approaches. Diagnosis relies on clinical evaluation, imaging studies, and occasionally nasal endoscopy. Treatment encompasses both pharmacologic and non-pharmacological interventions, including antibiotics for bacterial cases and intranasal corticosteroids to reduce inflammation. Surgical interventions like functional endoscopic sinus surgery may be required for refractory cases. Emerging therapies, such as biologics and minimally invasive procedures, offer promising alternatives to traditional management approaches.