Irritants are substances or factors that cause discomfort or inflammation in the body. They can be found in various forms, such as chemicals, allergens, or physical agents. Common examples include pollen, dust mites, and cigarette smoke, which can trigger reactions in sensitive individuals, leading to symptoms like sneezing, itching, or redness. In addition to environmental irritants, certain foods and medications can also act as irritants. For instance, spicy foods may cause digestive discomfort, while some antibiotics can lead to skin rashes. Understanding irritants is essential for managing allergies and sensitivities effectively.