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en.wikipedia.org/wiki/Allergic_response

An allergic response is a hypersensitive immune reaction to a substance that normally is harmless or would not cause an immune response in everyone. An allergic response may cause harmful symptoms such as itching or inflammation or tissue injury. Mechanism

www.webmd.com/allergies/allergic-reaction-causes

But whatever the reaction, it boils down to one thing: allergies. If you have allergies , you have lots of company. As many as 30% of U.S. adults and 40% of children are in the same boat as you.

www.healthline.com/health/allergies/allergic-reaction

An allergic reaction occurs when your body attacks a foreign substance that typically don’t pose a threat to the human body, called an allergen. You can inhale, eat, and touch allergens that ...

medlineplus.gov/ency/article/000005.htm

Allergic reactions are common. The immune response that causes an allergic reaction is similar to the response that causes hay fever. Most reactions happen soon after contact with an allergen. Many allergic reactions are mild, while others can be severe and life threatening.

www.emedicinehealth.com/allergic_reaction/article_em.htm

An allergic reaction is the body's way of responding to an "invader." When the body senses a foreign substance, called an antigen, the immune system is triggered. The immune system normally protects the body from harmful agents such as bacteria and toxins.

www.medicinenet.com/allergic_cascade/article.htm

In an allergic cascade, the immediate or "early" phase allergic reaction is subsequently followed by a more prolonged "late" phase reaction. Histamine is an important chemical mediator that causes many of the common allergic symptoms.

www.mayoclinic.org/diseases-conditions/allergies/symptoms...

For a severe allergic reaction (anaphylaxis), call 911 or your local emergency number or seek emergency medical help. If you carry an epinephrine auto-injector (Auvi-Q, EpiPen, others), give yourself a shot right away.

www.aafa.org/mold-allergy

In this condition, there is both an allergic and an inflammatory response to the mold. Symptoms may include severe wheezing, coughing and shortness of breath, much like asthma. Food fungi, like mushrooms, dried fruit, or foods containing yeast, vinegar or soy sauce, usually don’t cause allergy symptoms of the nose, eyes and lungs.

acaai.org/allergies/symptoms

Allergy Symptoms Allergy symptoms occur when your immune system overreacts to something that is harmless to most people but triggers a reaction in anyone sensitive to it. This substance is known as an allergen.

medical-dictionary.thefreedictionary.com/allergic+reaction

allergic [al-ler´jik] pertaining to or having an allergy. allergic reaction a local or general reaction characterized by altered reactivity of the animal body to an antigenic substance; see also allergy. al·ler·gic re·ac·tion a local or general reaction of an organism following contact with a specific allergen to which it has been previously ...