FESS Surgery: Functional Endoscopic Sinus Surgery Explained

When chronic sinusitis just won't respond to medication, Functional Endoscopic Sinus Surgery (FESS) offers a minimally invasive way to reopen blocked sinus passages — using a tiny camera instead of external incisions.

What Is FESS?

Functional Endoscopic Sinus Surgery, or FESS, is a minimally invasive surgical technique used to treat chronic sinusitis and related conditions like nasal polyps. Instead of external incisions, the surgeon works entirely through the nostrils using a thin, rigid telescope called an endoscope, which projects a magnified, high-definition view of the sinus passages onto a monitor. The goal is to widen the natural drainage channels of the sinuses so mucus can flow normally again and the sinuses can heal.

Why Is FESS Needed?

• Chronic rhinosinusitis that hasn't improved despite an adequate trial of antibiotics, nasal steroids, and saline irrigation
• Nasal polyps that are blocking the sinus openings
• Recurrent acute sinus infections that keep coming back due to a structural bottleneck
• Fungal sinusitis or, in some cases, sinus-related tumors that need to be accessed and removed
• As an access route for other procedures, such as repairing a cerebrospinal fluid leak or reaching the pituitary gland

FESS restores normal drainage pathways between the sinuses and the nose

Signs and Symptoms That May Point to Needing FESS

• Facial pressure or pain lasting 12 weeks or longer
• Persistent nasal blockage and thick discharge despite treatment
• Reduced or lost sense of smell
• Recurring sinus infections, sometimes several times a year
• Chronic headaches linked to sinus pressure

How the Surgery Works

1. Anesthesia. FESS is typically performed under general anesthesia, though some limited cases use local anesthesia with sedation.
2. Decongesting the nose. The nasal passages are first decongested with topical medication to reduce bleeding and improve visibility.
3. Endoscopic visualization. The surgeon guides a thin endoscope through the nostril, following each sinus's natural drainage pathway.
4. Clearing obstructions. Using fine instruments, the surgeon removes polyps, diseased tissue, or bone that's narrowing the sinus openings, widening the passage so the sinus can drain and ventilate properly.
5. Preserving healthy tissue. The technique is called "functional" because the goal is to preserve as much healthy mucous membrane as possible rather than stripping it out — this membrane is what allows the sinus to heal and function normally afterward.
6. Combined procedures. FESS is often paired with septoplasty if a deviated septum is contributing to the blockage.

Recovery

• First few days: Nasal congestion, mild discomfort, and light bleeding or drainage are expected as the packing (if used) is absorbed or removed.
• 1–2 weeks: Regular saline nasal rinses are usually prescribed to keep the healing passages clean and prevent crusting.
• Several weeks: Follow-up visits allow the surgeon to clean the sinus cavities and monitor healing, since the tissue takes time to fully settle into its new, open shape.

Risks and Considerations

• Bleeding or infection
• Recurrence of polyps or sinusitis over time
• Rarely, injury to structures near the sinuses, including the eye socket or the base of the skull, given their close proximity
• Temporary change in smell

Serious complications are uncommon in experienced hands, and studies generally report good long-term symptom relief for most patients.

Chronic sinusitis narrows the natural sinus drainage openings

The Takeaway

FESS has transformed the treatment of chronic sinusitis, offering a precise, camera-guided way to restore normal drainage without external cuts or visible scarring. If sinus problems have been dragging on for months despite medical treatment, ask your ENT specialist whether FESS could be the option that finally provides lasting relief.