An irritant, often referred to as a nuisance, is a substance or factor that causes discomfort or annoyance. This can include environmental elements like pollution, noise, or pesticides that negatively impact health or well-being. Irritants can provoke reactions such as coughing, sneezing, or skin irritation, depending on the individual's sensitivity. In daily life, irritants can be found in various forms, including strong odors from cleaning products or allergens like pollen. While some irritants may cause temporary discomfort, others can lead to more serious health issues if exposure is prolonged. Understanding and managing irritants is essential for maintaining a healthy environment.