The inflamed tissues produce a thick mucus. In addition, if inflammation happens often and is severe, it causes permanent thickening of the tissues in the airways. This is also called bronchospasm or bronchoconstriction. The airways are overly sensitive to animal dander, pollen, tobacco smoke, air pollution, the common cold, or even cold air. This blocks the flow of air.
Thick mucus plugs the smaller airways.
Breathing becomes a struggle. Whistling or wheezing sounds may start. Your chest feels tight. You may cough as you try to clear your lungs. You need to know how asthma affects your airways in order to know how you can control it.