A 35-year-old patient from Dong Nai, Kim Ngo, often experiences nasal congestion. She found that inhaling medicated oil initially helped, but its effectiveness waned over time. She wonders why this occurs and if she should consult a doctor.

Hoang, 30, experienced left-sided tinnitus and persistent nasal congestion, leading doctors to diagnose nasopharyngeal cancer with cervical lymph node metastasis, for which he received concurrent chemoradiation.

Foods rich in antioxidants, omega-3, and quercetin, such as citrus fruits and salmon, can help alleviate allergy symptoms.

"I experience prolonged, recurring unilateral nasal congestion. Is this condition dangerous, and when should I see a doctor?" asks Kien Vu, 35, from Dong Nai.

I have prolonged nasal congestion and a reduced sense of smell. My doctor diagnosed nasal polyps. Is this condition dangerous, and do I need surgery? (Nam Tran, 30, Can Tho)