When you experience anaphylaxis, it’s like a volcano erupting inside your body. The immune system’s protective white blood cells create antibodies that attach both to the foreign substance (the allergen) and to other bodily cells in a way that signals them to release inflammatory chemicals like histamine and serotonin, part of its defense strategy against infections. That makes the muscles of internal organs constrict and causes other visible symptoms of allergic reactions. .
During that severe reaction known as anaphylactic shock, the flood of chemicals from the immune system can cause a number of changes in the body. The Mayo Clinic lists a drop in blood pressure, narrowed airways, a weak pulse, flushed or pale skin, hives or a rash, nausea, vomiting, a swollen throat or tongue, and dizziness or fainting. If the person is not treated, anaphylaxis can be fatal — a victim could fall unconscious or the reaction can stop the heartbeat or cause the person to stop breathing.
Know the symptoms, know the signs, act quickly. .
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