many people with asthma or other lung problems also have nasal and sinus symptoms. drainage from your nose and sinuses can make asthma worse especially at night. a saltwater nasal wash or nasal irrigation can help reduce this. a nasal wash: cleans mucus from the nose so medication can be more effective cleans allergens and irritants from the nose reducing their impact cleans bacteria and viruses from the nose decreasing infections decreases swelling in the nose and increases airflow