Allergy
Allergy means that your body reacts negatively to certain substances, which can cause discomfort. Your immune system is involved in this reaction. On the other hand, hypersensitivity can lead to discomfort linked to a substance without your immune system being directly involved. Allergies usually occur during childhood but can also develop when you are an adult. On the other hand, hypersensitivity can occur both in childhood and adulthood. Allergies and hypersensitivity are common health problems.