I suffer from allergic rhinitis and work in Ho Chi Minh City. This year, I will celebrate Tet in Hanoi. What precautions should I take to prevent a recurrence? (Minh Huu, 40, Ho Chi Minh City)

I have allergic rhinitis, which often recurs in cold weather. This Tet I'm going to the North, where it's colder. What should I prepare to prevent recurrence? (Phu Nguyen, 30, Ho Chi Minh City)

My child has allergic rhinitis. Will displaying Tet flowers indoors worsen their symptoms, and how can I alleviate this condition? (Minh Nguyen, 40, Da Nang)

I often experience recurrent rhinosinusitis whenever the temperature changes, especially in cold weather. How can I prevent the disease from recurring and alleviate symptoms? (Lan Nguyen, Ho Chi Minh City)

I often experience nasal congestion and a runny nose, and my doctor diagnosed a deviated septum. What causes this condition, how is it treated, and is surgery necessary? (Linh Trang, 25, Can Tho)

Untreated chronic sinusitis can cause nasal lining swelling, congestion, eye complications, and a significant decline in quality of life.

Ms. Lan, 80 tuoi, experienced left-sided headaches radiating to the back of her neck and difficulty breathing; doctors diagnosed complicated fungal sinusitis.