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Anaphylaxis can happen within seconds or minutes of exposure to something a person is allergic to, called an allergen. Common allergic triggers include some foods, some medicines, bee stings and latex.

Anaphylaxis can make blood pressure drop quickly and cause the airways to narrow, called shock.

Anaphylaxis symptoms include:

• Hives, itching, and flushed or pale skin.
• A swollen tongue or throat. This can cause wheezing and trouble breathing.
• A fast, weak pulse.
• Nausea, vomiting or diarrhea.
• Dizziness or fainting.

Anaphylaxis needs emergency treatment. Medicine called epinephrine is used to treat it. If not treated right away, it can cause a person to faint or die.

Other treatments include medicines such as antihistamines and cortisone and therapies to help with breathing, including oxygen.