Many allergic reactions and anaphylaxis symptoms are similar because both conditions involve an allergic response from the immune system. Mild allergic reactions cause minimal symptoms ...

Hives, also known as urticaria, are raised, itchy welts on your skin that occur due to an allergen. The reaction is ...

Medically reviewed by Jurairat J. Molina, MD Allergies are an immune system reaction to substances called allergens. The ...

Find out why stress can worsen allergy symptoms. Learn about the cellular chain reaction that occurs in the body and how it ...

An allergic reaction, or when your immune system overreacts to a harmless substance, can sometimes manifest in the form of a rash. An allergy rash can be uncomfortable and lead to infections ...

They happen when the immune system reacts to a substance that it wrongly perceives as a threat, launching an attack that endangers the body’s own tissues and organs. The most common causes of ...

Ian McKnight is researching the biological mechanisms underlying allergies, with the goal of developing new therapeutics to ...

Bee stings are not just a painful inconvenience; they are the result of a highly evolved biological defense mechanism. When a bee stings, it injects venom, which contains a complex mixture of proteins ...