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Swelling of the bronchioles due to allergies is what causes asthma.
Explanation:
1. Asthma is a condition where the airways narrow and swell, leading to symptoms like shortness of breath, wheezing, coughing, and chest tightness.
2. When someone with asthma is exposed to allergens like dust mites, pollen, or pet dander, their immune system overreacts, causing inflammation and swelling in the bronchioles (small airways in the lungs).
3. This swelling makes it difficult for air to move in and out of the lungs, resulting in the typical symptoms of asthma.
Therefore, swelling of the bronchioles due to allergies is what causes asthma.
