Self-medicating with nasal sprays and decongestants, or stopping medication prematurely, can lead to persistent recurrence of allergic rhinitis and complications.

I suffer from chronic sinusitis, which worsens with seasonal changes. Will daily nasal rinsing resolve it? (Kim Trang, 35, TP HCM)

Nghiem Tran, 50, from Ho Chi Minh City, asks if recurrent sinusitis with nosebleeds in cold weather is dangerous and how it should be treated.

I was recently diagnosed with polysinusitis. What is this condition, what causes it, and how is it treated? (Hung Loan, Lam Dong)

Symptoms of fungal sinusitis vary by type, with the most common including headache, nasal congestion, facial pain or pressure, and nasal discharge.

I was diagnosed with cavernous sinus thrombosis. What is this disease, and is it a complication of sinusitis? (Phu Trung, 55 years old, Da Nang)