Bothered by a stuffed-up nose?

Several problems can block the passages on one or both sides of the nose. For example, allergies can inflame sensitive tissue inside the nose, reducing the space left for air to flow through nasal passages; a crooked wall (septum) separating the passages of the nose can block airflow, making it hard to breathe; and aging can cause tissues in the nose to sag, which can narrow nasal passages. Strategies to open nasal passages depend on the cause of obstruction. Treatments range from using nasal sprays to widening nasal passages with surgery.