Humidity Can Worsen Sinus Symptoms Even Without Infection, ENT Expert Explains
Humidity may worsen sinus symptoms even without an infection.
Sinus symptoms can worsen during the monsoon even when there is no infection, according to ENT expert Dr Trisha Srivastava. While damp weather is often blamed directly for blocked noses and sinus trouble, the doctor explained that increased humidity can instead encourage the growth of allergens such as dust mites and mould, which may trigger allergic reactions in susceptible people.
Dr Srivastava explained that moisture itself does not necessarily thicken nasal mucus. The nose has a natural mucus-and-cilia system that helps clear particles and secretions, and this system generally functions well in warm, humid conditions. However, prolonged monsoon humidity can create favourable conditions for indoor allergens. Dust mites multiply when humidity rises above 50 per cent, while persistent dampness can encourage mould growth.
Increased exposure to these allergens can cause the lining of the nose and sinuses to become swollen, producing symptoms such as congestion and a sensation of blockage. These symptoms can resemble an infection, even when there is no bacterial or viral infection involved. Warm, humid air can also alter how the nose perceives airflow, making the nose feel more blocked even when there is not necessarily a major physical narrowing of the nasal passages.
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Dr Srivastava recommends keeping indoor humidity between 30 and 50 per cent to help limit the growth of dust mites and mould. Using an air conditioner’s dry mode or a dehumidifier can help control excess moisture. Other measures include avoiding drying clothes indoors with windows closed, exposing mattresses and bedding to sunlight when practical, regularly washing bedding and cleaning visible mould before it spreads.
Saline nasal irrigation can also help clear allergens and secretions from the nasal passages, although it should be done safely using appropriately prepared saline and clean water. People should avoid assuming that every episode of congestion requires antibiotics, as many monsoon-related symptoms can be allergy-driven rather than infectious.
Medical evaluation is important when symptoms are persistent or accompanied by warning signs. Dr Srivastava advises seeking medical attention for fever with facial swelling, symptoms lasting beyond 10 days, symptoms that improve and then become worse again, one-sided nasal blockage or bleeding, or changes in vision. These features can indicate a condition requiring assessment rather than routine seasonal congestion.
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