Chronic sinusitis is a persistent inflammation of the sinus linings, often lasting over 12 weeks, where blocked drainage pathways lead to a painful buildup of mucus and pressure. The most debilitating symptoms include facial pain or pressure, thick nasal discharge, nasal congestion, and a reduced sense of smell, often accompanied by fatigue. Initial medical treatments involve nasal corticosteroid sprays, saline rinses, and antibiotics for infections. When these fail, Functional Endoscopic Sinus Surgery (FESS) is a common, minimally-invasive procedure that opens blocked sinus pathways to restore drainage and function. For this, you should consult an ENT (Ear, Nose, and Throat) Specialist (Otolaryngologist) at a hospital with a strong ENT department. The cost of FESS can range from $10,000 to $30,000 or more, depending on complexity. To prevent recurrence, consistent daily nasal saline irrigation, avoiding allergens, and using maintenance steroid sprays as prescribed are crucial for long-term management.