Class 4 Allergy Symptoms: Recognizing & Responding to Severe Reactions

Class 4 allergy symptoms are the most severe and potentially life-threatening. They can include:

* Anaphylaxis: A sudden, severe allergic reaction that can cause death if not treated immediately. Symptoms of anaphylaxis include:

* Difficulty breathing

* Swelling of the throat, tongue, or face

* Chest pain

* Low blood pressure

* Fainting

* Nausea and vomiting

* Diarrhea

* Skin rash

* Hives

* Laryngeal edema: Swelling of the larynx (voice box) that can cause difficulty breathing.

* Bronchospasm: Constriction of the airways that can cause wheezing, coughing, and shortness of breath.

* Cardiac arrhythmias: Irregular heartbeats that can be fatal.

* Cardiovascular collapse: A sudden drop in blood pressure that can lead to fainting or death.

If you experience any of these symptoms, seek medical attention immediately.