Article in English: Nasal congestion can point to many different causes. The most common causes are infections like cold, flu, and sinusitis and allergies. Environmental irritants like chemicals or smoke can also cause congestion.  Some people have chronic runny nose — a condition known as vasomotor rhinitis or VMR. Viruses are difficult to treat because they live in the body's cells and reproduce very quickly. Luckily, the most common viral infections are cold and flu, which resolve on their own with time. Treatment is essentially about managing the symptoms and staying as comfortable as possible. To prevent the flu, get an annual vaccination before flu season begins. The symptoms of cold and flu include:  Fever Runny or stuffy nose Clear, green, or yellow nasal discharge Sore throat Coughing and sneezing Fatigue Muscle aches and headaches Watery eyes The flu has additional symptoms: a higher fever (over 102 °F or 39.9 °C), nausea, chills/sweats, and loss of appetite Bacterial infections can have widely varying symptoms, including fever. Most bacterial infections are diagnosed clinically or occasionally by a nasal or throat culture. The doctor will be prescribe the antibiotic most likely to treat the most common bacteria. The antibiotic will either kill the bacteria or stop it from reproducing, allowing the immune system to fight the remaining infection. Always take the full course of antibiotic treatment, even if you feel better. If you stop taking the treatment before the doctor recommends it, the infection may return. Sinusitis is a condition in which the sinuses get inflamed and swollen, causing mucus buildup. It can be caused by a cold, allergies, or bacterial or fungal infections. Though it can be irritating, sinusitis can usually be treated at home without medical intervention. More severe or persistent sinus infections are usually treated with antibiotics. Symptoms include:  Thick yellow or green nasal discharge, often found in the throat as well Nasal congestion Tenderness and swelling around the eyes, cheeks, nose,...

Summary in Vietnamese:
Xem xét nhiều khả năng khác nhau. Tìm dấu hiệu nhiễm trùng virus. Uống kháng sinh điều trị nhiễm trùng vi khuẩn. Tìm triệu chứng viêm xoang. Xác định xem ánh sáng đèn có mạnh quá không. Xét nghiệm dị ứng. Loại bỏ chất kích ứng khỏi môi trường sống. Hỏi ý kiến bác sĩ về việc dùng thuốc. Xem xét những thay đổi về hóc môn. Kiểm tra cấu tạo sinh học của mũi.