Airways carry air to the lungs. Airways get smaller and smaller like branches of a tree. When asthma is under control, the sides of the airways in the lungs are always thick and swollen. An Asthma attack can happen easily . During an asthma attack, less air can get in and out of the lungs.
People cough and wheeze.
The chest feels tight. Many things can start asthma attacks. Among these are animals with fur, cigarette smoke, dust in beds and pillows, dust from sweeping, strong smells and sprays, pollen from trees and flowers, the weather, colds and running. Sometimes these things are called asthma triggers. You cannot cure asthma, but you can control asthma.