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Severe allergic reactions can be triggered by many different substances. Common causes include foods such as peanuts, shellfish, milk, eggs, and tree nuts. Certain medications, including antibiotics and pain relievers, may also trigger anaphylaxis in susceptible individuals. Insect stings—especially from bees and wasps—are another well-known cause, as are latex and some environmental allergens.
One of the greatest dangers is delaying treatment. Some people assume that a rash is "just an allergy" and wait for it to improve on its own. Unfortunately, once breathing becomes affected, the condition can worsen rapidly and may lead to airway obstruction, shock, or loss of consciousness if left untreated.
Medical experts emphasize that rapid action saves lives. If someone develops hives together with breathing difficulty, emergency medical services should be contacted immediately. If an epinephrine auto-injector is available and has been prescribed, it should be used without delay while waiting for emergency care. The person should remain lying down or in a comfortable position and be closely monitored until help arrives.