Which of the following can be a trigger for asthma?

Asthma triggers can vary widely among individuals, but allergens are one of the most common causes of asthma exacerbations. Allergens such as pollen, mold spores, pet dander, dust mites, and certain foods can provoke inflammatory responses in the airways of individuals with asthma. When exposed to these substances, the immune system may overreact, leading to symptoms like wheezing, shortness of breath, chest tightness, and coughing.

While stress, fever, and bacterial infections can also influence asthma symptoms or trigger episodes, they are generally considered secondary triggers compared to allergens. For instance, stress can contribute to asthma exacerbations due to its effects on the body’s physiological state, but it does not directly cause inflammation in the airways like allergens do. Similarly, fever and bacterial infections can complicate asthma management and lead to respiratory distress, but they are not primary triggers of the underlying asthma condition. Thus, allergens stand out as a primary catalyst for asthma symptoms, making them a critical focus in asthma management and prevention strategies.