Introduction
Chennai waits all year for the northeast monsoon. The rain cools the city, fills our lakes and gives relief from the heat. But every year, from October to December, my clinic also fills up with patients who have cough, wheezing, fever and breathlessness.
This is not a coincidence. In this blog, I will explain why the rainy season is hard on the lungs and share 10 easy tips that you and your family can follow at home.
Why Does the Monsoon Affect Your Lungs?
Three things happen together during the rains:
1. Viruses spread faster. Flu and other cold viruses love cool, damp weather. Studies on Indian flu patterns show that Chennai and Vellore see their flu peak during the late monsoon months of October–November1, unlike most of North India. 2. Mould grows inside homes. Wet walls, damp clothes and closed windows create the perfect place for fungus (mould). Mould spores are a common trigger for asthma and allergies. 3. We stay indoors with windows shut. This traps smoke from cooking, incense (agarbatti) and mosquito coils inside the house.
People with asthma, COPD, diabetes, heart disease, the elderly and young children are most at risk.
10 Monsoon Lung Care Tips
Get Your Flu Vaccine on Time
The flu vaccine is the single best protection against seasonal flu. For Chennai, Indian expert guidelines suggest vaccinating around September–October, before the local flu peak2. If you have missed it, it is still worth taking now. Ask your doctor.
Keep Your Home Dry
- Fix leaking roofs and wet patches quickly.
- Do not dry wet clothes inside closed bedrooms.
- Use an exhaust fan in the bathroom and kitchen.
- Wipe visible black or green mould with soap and water (wear a mask while cleaning).
Let Fresh Air In
Open windows for some time when it is not raining. Cross-ventilation reduces dampness and indoor smoke.
Say No to Mosquito Coils in Closed Rooms
Mosquito coils feel harmless, but research shows that burning one coil can release as much fine particle pollution as 75–137 cigarettes3. Use mosquito nets, window mesh or repellent creams instead, especially in rooms where children and elderly people sleep.
Asthma Patients: Never Stop Your Preventer Inhaler
Many patients stop their daily inhaler when they feel fine. The monsoon is the worst time to do this. Keep your reliever inhaler with you at all times, and check that it is not empty.
Wash Hands Often
Most cold and flu viruses spread through hands. Wash with soap for 20 seconds, especially before eating and after travelling in buses or trains.
Avoid Walking in Floodwater
Floodwater can carry a germ from rat urine that causes leptospirosis. Many people do not know that this disease can affect the lungs. According to the national guidelines on leptospirosis4, lung bleeding is the most common cause of death from this illness. If you must walk in water, wear gumboots and wash your feet well afterwards. See a doctor quickly if you get fever, body pain and red eyes after wading through water.
Eat Warm, Fresh, Home-Cooked Food
Good nutrition supports your immunity. Drink boiled or filtered water. Warm fluids like soup and rasam soothe the throat.
Protect Children and Elders
Keep children's school uniforms and shoes dry. Make sure elderly family members and those over 50 have discussed the pneumococcal (pneumonia) vaccine5 with their doctor.
Do Not Ignore a Cough That Does Not Go Away
A cold usually settles in 7–10 days. If your cough lasts more than 2 weeks, or you have fever, weight loss or blood in your sputum, see a doctor. The WHO advises that a cough lasting more than 2 weeks6 should be checked, as it could be tuberculosis.
Warning Signs: See a Doctor Immediately If You Have
- Breathlessness while resting or talking
- Lips or fingertips turning bluish
- High fever for more than 3 days
- Chest pain while breathing
- Coughing up blood
- In children: fast breathing, chest "pulling in" while breathing, or not feeding well
Frequently Asked Questions
Q1.Can rain directly cause pneumonia?
Getting wet does not directly cause pneumonia. But the monsoon increases the spread of viruses and bacteria, which can lead to chest infections, especially in people with weak immunity.
Q2.Is it safe to take the flu vaccine during the monsoon?
Yes. It is safe and still useful, even if the season has already started.
Q3.Should asthma patients use a steam inhaler during the rains?
Steam can give short-term comfort, but it does not replace your prescribed inhalers. Be careful with very hot water, especially around children.
Q4.Is a humidifier useful in Chennai's monsoon?
Usually not. The air is already very humid. A dehumidifier may help in damp rooms.
KEY TAKEAWAY
The Bottom Line
The monsoon is a beautiful season, and with a few simple habits, you can enjoy it without spending it in a hospital bed. Keep your home dry, vaccinate on time, take your inhalers regularly, and do not ignore warning signs.
If you or a family member has breathing trouble this monsoon, please consult a lung specialist early. Early treatment is always simpler and safer.
Sources & references
- Chennai and Vellore see their flu peak during the late monsoon months of October–November pmc.ncbi.nlm.nih.gov/articles/PMC4418715/
- Vaccinating around September–October, before the local flu peak pmc.ncbi.nlm.nih.gov/articles/PMC7703812/
- Burning one coil can release as much fine particle pollution as 75–137 cigarettes pmc.ncbi.nlm.nih.gov/articles/PMC2859469/
- National guidelines on leptospirosis ncdc.mohfw.gov.in/uploads/pdf/PPCL%20National%20Guidelines.pdf
- Pneumococcal (pneumonia) vaccine cdc.gov/pneumococcal/vaccines/index.html
- WHO advises that a cough lasting more than 2 weeks who.int/europe/news-room/events/item/2025/09/26/default-calendar/just-…
ABOUT THE AUTHOR
Dr. Koushik Muthu Raja Mathivanan, M.D.
Dr. Koushik Muthu Raja Mathivanan is a Consultant Pulmonologist in Chennai treating asthma, COPD, tuberculosis, lung infections and sleep disorders.
This article is for general awareness and does not replace a consultation with your doctor.
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Online articles can support awareness, but they cannot replace an individual medical assessment.