What causes nasal congestion in children?

There are many possible causes of nasal congestion in children, with common ones including colds, allergies, and rhinitis. During a cold, the nose becomes congested and swollen, narrowing the nasal passages and increasing mucus production, which affects breathing. Allergies can also cause nasal swelling, congestion, and runny nose. Rhinitis refers to inflammation inside the nasal cavity, leading to swelling, pain, and increased secretions. Dry air or overuse of nasal sprays may also result in dryness, irritation, and nasal congestion.