I have chronic allergic rhinitis. Each time I sneeze, inhaling medicated oil helps, but is it good for long-term use? (Thu Nga, 28, 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.

Rinsing the nose and throat with physiological saline solution, staying warm, and wearing a mask during cleanup help prevent bacteria and viruses from entering the upper respiratory tract.

Mr. Lang, 58, experienced frequent nasal congestion, leading to the discovery of a small, asymptomatic nasal tumor, which has now bled, prompting a cancer diagnosis.