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Anaphylaxis is a severe, life-threatening allergic reaction that begins very quickly. It involves the body's immune system releasing a flood of chemicals that can cause the person to go into shock, making breathing difficult and causing a sudden drop in blood pressure.
read more about anaphylaxis ...The cause is exposure to an allergen. Common triggers include certain foods (like peanuts or shellfish), insect stings (like bees or wasps), medications, and latex. The reaction requires prior exposure to the allergen.
Symptoms occur quickly after exposure to an allergen and affect multiple body systems. Skin reactions such as hives, redness, and swelling appear first. Swelling of the lips, tongue, or throat can make breathing difficult. Dizziness, rapid heartbeat, and low blood pressure may follow, sometimes leading to loss of consciousness. Gastrointestinal symptoms like nausea or abdominal cramps can also occur. Immediate emergency treatment with epinephrine is needed to prevent serious complications.
Anaphylaxis directly and immediately impacts eye health through swelling. The release of histamines causes severe, rapid swelling of the eyelids and the conjunctiva (the clear membrane over the eye), which can temporarily restrict vision. Ocular redness is also immediate and severe.
Anaphylaxis requires immediate emergency treatment with an injection of epinephrine (adrenaline). This injection helps constrict blood vessels, open the airways, and reverse the symptoms of shock. Emergency medical services should be called immediately.
Prevention involves strict avoidance of known allergens. People with severe allergies carry an auto-injector pen (EpiPen) containing epinephrine and wear medical alert jewelry to inform others of their condition.
The reaction usually occurs within seconds or minutes of exposure to the allergen.
No, driving is unsafe. Epinephrine must be administered immediately, and emergency services should be called.
Yes, epinephrine is the only life-saving treatment and should be used immediately upon signs of a severe reaction.
Anaphylaxis can cause rapid swelling of the eyelids and conjunctiva (Chemosis). If you experience "hives" near the eye along with throat tightness, use your EpiPen and call 911. Delaying treatment can lead to rapid airway closure.
NHS. Anaphylaxis (nhs.uk). 2023.
MedlinePlus. Anaphylaxis (medlineplus.gov). 2024.
Cleveland Clinic. Severe Allergic Reactions (clevelandclinic.org). 2023.
Right Decisions. Emergency Anaphylaxis Treatment (rightdecisions.scot.nhs.uk). 2025.