What are severe and sometimes fatal allergic reactions?

Anaphylaxis is a severe, potentially life-threatening allergic reaction that can occur within seconds of exposure to an allergen. Symptoms can include difficulty breathing, swelling of the face, throat, and tongue, hives, nausea, vomiting, and diarrhea. Anaphylaxis can be caused by a variety of allergens, including foods (such as peanuts, shellfish, and milk), insect stings (such as bees and wasps), and medications (such as penicillin and aspirin).

Anaphylaxis is a medical emergency and requires immediate treatment with epinephrine (adrenaline). Epinephrine is a medication that can help to relax the airways and reduce swelling. If you have a history of anaphylaxis, you should carry an epinephrine auto-injector (EpiPen) with you at all times and be aware of the signs and symptoms of anaphylaxis.

In addition to anaphylaxis, there are several other severe and sometimes fatal allergic reactions that can occur. These reactions include:

* Angioedema: Angioedema is a swelling of the deep layers of the skin and can occur in response to a variety of allergens, including foods, insect stings, and medications. Angioedema can cause swelling of the face, lips, tongue, and throat, which can lead to difficulty breathing.

* Urticaria: Urticaria, also known as hives, is a condition that is characterized by the development of red, itchy bumps on the skin. Hives can be caused by a variety of allergens, including foods, insect stings, and medications. In some cases, hives can be a sign of a more serious allergic reaction, such as anaphylaxis.

* Eczema: Eczema is a chronic skin condition that is characterized by dry, itchy skin. Eczema can be caused by a variety of factors, including genetics, environmental triggers (such as dust mites and pollen), and certain foods. In some cases, eczema can be associated with food allergies.

If you experience any of the symptoms of a severe allergic reaction, it is important to seek medical attention immediately.