This inflammation makes the airways sensitive and reactive to various triggers, which can include allergens like pollen 4 and pet dander, irritants such as smoke or strong odors, physical activity, and even weather changes. When a person with asthma is exposed to these triggers, they may experience symptoms like wheezing, shortness of breath, chest tightness, and coughing. These symptoms can vary in intensity and may occur frequently or only sporadically, making asthma a complex condition to manage.