Health condition · plain-language reference

Anaphylaxis

Also called: Anaphylactic shock

Anaphylaxis is a serious allergic reaction . It can begin very quickly, and symptoms may be life-threatening. The most common causes are reactions to foods (especially peanuts), medications , and stinging insects . Other causes include exercise and exposure to latex . Sometimes no cause can be found. It can affect many organs: Skin - itching, hives, redness, swelling Nose - sneezing, stuffy nose, runny nose Mouth - itching, swelling of the lips or tongue Throat - itching, tightness, trouble swallowing, swelling of the back of the throat Chest - shortness of breath, coughing, wheezing, chest pain or tightness Heart - weak pulse, passing out, shock Gastrointestinal tract - vomiting, diarrhea, cramps Nervous system - dizziness or fainting If someone is having a serious allergic reaction, call 911. If an auto-injector is available, give the person the injection right away.

Plain-language summary from MedlinePlus (NIH/NLM) ↗. For informational purposes only — not medical advice.