Respiratory Tract Protection

The respiratory tract is a continuous mucosal barrier from nose to alveoli, defended by the mucociliary escalator, secretory IgA and antimicrobial peptides. Dry air slows ciliary clearance and thickens mucus, which is why infection rates rise in heated indoor winter conditions. Chronic mouth breathing bypasses nasal filtration, humidification and nitric oxide production. Persistent hoarseness, cough beyond three weeks, or blood in sputum needs clinical assessment rather than self-management.

1) Stop smoking and vaping — the single largest determinant of mucosal integrity. 2) Keep indoor humidity at 40-60%; dry air impairs mucociliary clearance and increases viral survival. 3) Breathe through the nose, which filters, warms and humidifies air and delivers nasal nitric oxide to the lower airway. 4) Use saline nasal irrigation during high-exposure periods to clear allergens and pathogens mechanically. 5) Correct vitamin D deficiency with daily dosing. 6) Keep vaccinations current — the highest-yield intervention for serious respiratory infection. 7) Zinc lozenges within 24 hours of cold onset shorten duration; other formats do not. 8) Avoid excessive prolonged endurance training, which transiently suppresses mucosal IgA.

• •Smoking and vaping cessation
• •Indoor humidity 40-60%
• •Nasal breathing
• •Saline nasal irrigation
• •Vaccination
• •Hand hygiene
• •Avoiding overtraining