Six-year-old An, who suffered from a dry cough for half a year, was diagnosed by doctors with bronchial asthma and allergic rhinitis linked to house dust mites.

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)

Allergies are essentially a "mistake" by the immune system, overreacting to normally harmless environmental factors such as house dust and pollen.

I often have a stuffy nose, clear runny discharge, and not much sneezing, and was diagnosed with vasomotor rhinitis. How does this condition differ from allergic rhinitis, and what are the treatment options? (An Nhien, 35 years old)