What is a common trigger for allergic reactions?

A common trigger for allergic reactions is indeed normal everyday substances. Allergic reactions occur when the immune system mistakenly identifies a substance as harmful and overreacts to it. Everyday substances, such as pollen, dust mites, pet dander, certain foods, and latex, can cause these reactions in susceptible individuals.

While other substances may cause reactions or illnesses, they are not typically classified as allergens in the same way that everyday substances are. For instance, bacteria and viruses can cause infections, and while pesticides can trigger reactions, they are not as universally encountered as the everyday allergens that individuals might come into contact with on a regular basis. This makes normal everyday substances a primary concern when it comes to allergic reactions, as they are commonly present in an individual's environment and can provoke immune responses in sensitive individuals.