Functional Endoscopic Sinus Surgery (FESS) is a surgical procedure used to treat chronic sinus diseases. It is a minimally invasive technique that involves inserting an endoscope, a thin tube with a camera, into the nasal and sinus cavities to visualize and access the affected areas.

FESS is performed to alleviate symptoms and address underlying issues such as nasal polyps, chronic sinusitis, sinus infections, sinus tumors, and structural abnormalities in the sinuses. The procedure aims to restore normal sinus function by removing inflamed tissues, polyps, and obstructions, and improving sinus drainage.

During FESS, the surgeon uses specialized instruments to remove diseased tissue, open blocked sinus passages, and correct any structural abnormalities. The surgery is typically performed under local or general anesthesia, and patients are often able to go home the same day or after a short hospital stay.

FESS offers several advantages over traditional open sinus surgery, including reduced surgical trauma, faster recovery time, and minimal scarring. It is considered a safe and effective treatment option for individuals with chronic sinus conditions that do not respond well to medical management. However, as with any surgical procedure, there are potential risks and complications that should be discussed with a qualified healthcare professional.