Can ongoing damp and mold exposure irritate the upper airway and contribute to rhinitis and nasal congestion?

Damp, mold-contaminated indoor environments are a credible population-level contributor to upper-airway and respiratory symptoms. This is particularly relevant when exposure is ongoing, visible water damage or mold is present, or a musty odor suggests persistent moisture and microbial growth.

Clinical evidence

• Meta-analysis of 11 studies found dampness/mold exposure associated with rhinitis (OR 1.51, 95% CI 1.37–1.66).
• A 13-study meta-analysis found increased odds of upper-airway symptoms—including stuffy/runny nose and nasal symptoms—in damp or moldy homes (OR 1.70, 95% CI 1.44–2.00).
• Adult longitudinal data link home dampness/mold during follow-up to incident rhinitis after adjustment for age, sex, smoking, BMI, and education. Child cohort findings similarly associate repeated or follow-up exposure with incident allergic rhinitis.
• WHO evidence also links damp or moldy buildings with respiratory symptoms, allergies, and asthma; evidence additionally supports associations with respiratory infections.

Irritant and broader respiratory effects

• CDC and EPA identify nasal congestion, sneezing, rhinorrhea, throat irritation, and eye irritation as potential effects of indoor dampness and mold.
• Respiratory effects are not necessarily attributable to fungal material alone. Damp buildings can also contain dust mites, bacteria, allergens, volatile chemicals, and emissions from damaged materials, all of which may contribute to mucosal irritation or allergic symptoms.

Practical implications

• The priority intervention is correcting the moisture source: repair leaks or intrusion, dry materials promptly, clean salvageable surfaces, and remove porous materials that cannot be thoroughly dried.
• Routine mold-species testing or air sampling is generally not required before remediation when dampness, visible mold, or water damage is evident.
• Repair-focused remediation has moderate-quality evidence of reducing asthma-related symptoms and adult respiratory infections, supporting moisture control even though benefits specifically for rhinitis are less precisely quantified.

Bottom line

• Persistent indoor dampness and mold are well-supported associations with rhinitis, nasal congestion, upper-airway irritation, and respiratory symptoms. They cannot prove the cause of symptoms in any one person, but visible mold or ongoing dampness warrants remediation and consideration alongside other allergic, infectious, and non-environmental causes.