👉 Nasopharyngitis is a viral infection of the nasal cavity and pharynx, which occurs when bacteria or viruses enter the nasal passages. It can be caused by various factors such as colds, flu, allergies, or certain medications. The symptoms include a runny nose, sneezing, cough, difficulty breathing in the chest area, and a sense of pressure under the chin. Treatment typically involves rest, over-the-counter pain relievers, and avoidance of triggers like pollen and