Nasal obstruction refers to a blockage in the nasal passages, making it difficult to breathe through the nose. This condition can be caused by various factors, including allergies, sinus infections, or structural issues like a deviated septum. Symptoms often include difficulty breathing, snoring, and a reduced sense of smell. Treatment for nasal obstruction depends on the underlying cause. Common approaches include nasal sprays, antihistamines, or in some cases, surgery to correct structural problems. Maintaining good nasal hygiene and avoiding allergens can also help alleviate symptoms and improve airflow through the nasal passages.