Nasal congestion occurs when the tissues lining the nasal passages become swollen or inflamed, often due to infections, allergies, or irritants. This swelling can block airflow, making it difficult to breathe through the nose. Common symptoms include a stuffy or runny nose, sneezing, and pressure in the face. The condition can be temporary, such as during a cold or allergic reaction, or chronic, lasting for weeks or longer. Treatment options include decongestants, saline nasal sprays, and antihistamines, which help reduce swelling and relieve symptoms. Staying hydrated and using a humidifier can also provide relief.