Allergies are medical conditions caused primarily by hypersensitivity of the immune system to some external stimulus. Allergy may cause anaphylaxis—a medical condition that can cause irritation of the skin, swelling of throat, shortness of breath, and in some cases, death. Allergies are caused by various allergens such as pollen grains, or certain foods such as peanuts.

Leave a Reply

Your email address will not be published. Required fields are marked *