Of the most important reasons: 1. viral infections: flu and other viruses cause nasal congestion during the common cold, especially in winter and cause general symptoms such as heat, fatigue and joint pain. Treatments here to ease congestion and general symptoms, there is no need for antibiotics, where the inflammation disappears over 3-7 days. 2. allergic rhinitis: nasal corneas are present inside the nose on both sides. Its goal humidified air ...