Nasal infections, commonly referred to as sinus infections or sinusitis, are a frequent health concern during the monsoon season. Characterised by inflammation or swelling of the tissue lining the sinuses, these infections occur when mucus drainage is blocked, allowing bacteria, viruses, or allergens to thrive. The monsoon’s high humidity, waterlogging, and damp surroundings create an ideal environment for the growth of fungi, mold, and other infection-causing microbes. Sudden temperature changes and exposure to allergens further weaken the immune system, making the sinuses more vulnerable. Understanding the causes, recognising symptoms, and taking preventive steps can help you stay healthy during the rainy season. Understanding nasal infections and reasons behind their rise during monsoonSinusitis occurs when the tissue lining your sinuses becomes inflamed or swollen. Your sinuses are air-filled cavities in your face that produce mucus to help keep your nose clean and free of germs. However, when these sinuses get blocked and filled with fluid due to bacterial or viral infections, or allergies, it can lead to a range of uncomfortable symptoms. The sinuses are connected by narrow passages that allow mucus to drain out of the nose, and when this drainage is disrupted, it can cause problems.Causes:Humidity and moisture: Excess moisture in the air creates the perfect breeding ground for bacteria, viruses, and fungi. When inhaled, these microorganisms irritate the nasal passages, leading to inflammation and infection.Environmental allergens: Damp corners, leaky ceilings, and poorly ventilated spaces encourage mold growth, which releases spores into the air. When inhaled by sensitive individuals, these spores can trigger allergic rhinitis.Temperature fluctuations: Sudden shifts in temperature can stress the body's immune system, reducing its ability to filter and fend off invading pathogens.Airborne pathogens: Waterlogging and clogged drainage systems become reservoirs for pollutants and airborne pathogens, increasing the risk of respiratory and nasal infections.Poor diet and less movement: Monsoon-related lifestyle changes can impact immunity, weakening the body's defense mechanisms.Common symptoms of nasal infectionsFrequent sneezingRunny noseNasal congestionItchy eyesHeadachesFacial painFeeling of heaviness in the headHow to identify the difference between nasal infections, COVID-19, cold, and allergiesIt can be challenging to determine whether you're experiencing sinusitis, COVID-19, a cold, or an allergy, as the symptoms often overlap. However, there are some key differences to look out for. Colds tend to develop gradually, peak, and then resolve on their own within a few days to a week. Allergies often cause sneezing, itchy eyes and nose, congestion, and postnasal drip, but typically don't lead to facial pain. COVID-19, on the other hand, may present with additional symptoms, such as fever and shortness of breath. Notably, colds, COVID-19, and allergies can all trigger sinus infections. If you're unsure about your symptoms, consider getting tested for viral infections, such as COVID-19 and the flu.Tips to prevent nasal infectionsMaintain nasal hygiene: Use saline nasal sprays or neti pot rinses to clear mucus, dust, and allergens from your nasal passages. This simple practice can help reduce nasal congestion, prevent infections, and improve overall respiratory health. Boost your immunity: Incorporate immunity-boosting foods like turmeric, ginger, garlic, citrus fruits, leafy greens, and probiotics into your daily meals.Avoid sudden temperature changes: Regulate temperature changes gradually and use a scarf or mask when stepping outdoors.Wear a mask: Wearing a mask helps filter out allergens and reduces exposure to infection-causing microbes in crowded or polluted places, especially during flu season or travel.Also read | Chikungunya symptoms that might go unnoticed