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Definition
By Mayo Clinic staffNasal congestion (stuffy nose) occurs when nasal tissues and blood vessels become swollen with excess fluid, causing a "stuffy" feeling. Nasal congestion can be caused by a cold, influenza, allergies to dust, pollen or pet dander, or as a response to irritants such as tobacco smoke. Nasal congestion may or may not be accompanied by a runny nose as well.
Nasal congestion is just an annoyance for most older children and adults. But nasal congestion can be serious in infants, who might have a hard time nursing or breathing as a result.
Causes
