Hypersensitivity can be triggered by various factors, with some being more prevalent than others. Allergens, such as pollen, dust mites, pet dander, and certain foods, are common culprits that can lead to allergic reactions. Environmental factors, including chemicals, fragrances, and pollutants, can also contribute to hypersensitivity. Additionally, certain medications, insect bites, and autoimmune disorders can induce hypersensitivity reactions. It is essential to identify the specific cause of hypersensitivity in order to effectively manage and prevent future reactions.