I often have nasal congestion and foul-smelling mucus, and I have been diagnosed with sinusitis. What is this condition, and when does it require surgery? (Hoang Linh, 45, Tay Ninh)

Untreated nasal polyps can cause sinus and ear infections, leading to loss of smell, facial pressure, and recurring ear infections.

I often have a stuffy nose, sore throat, and foul-smelling nasal discharge. I'm worried about a sinus infection but don't know the cause. Is this condition dangerous? (Dung Tran, 31 years old, TP HCM)

45-year-old Khuyen, experiencing nasal congestion, forehead pain, and left eye swelling, underwent successful mucocele removal surgery aided by artificial intelligence (AI).

After recovering from influenza A, 56-year-old Ms. Duong experienced persistent fatigue, occasional fevers of 38°C, foul-smelling nasal discharge, and facial pain. Doctors diagnosed her with a fungal sinus infection.

I have chronic sinusitis. When I use the air conditioner at work, my congestion, itching, and pain worsen. Why is this, and what can I do to alleviate the symptoms? (Linh Han, 35, Ho Chi Minh City)

25-year-old Khai experienced severe headaches, vomiting, blurred vision, and swelling in his right eye, leading doctors to diagnose him with complicated purulent rhinosinusitis.