---
title: "Allergic Reaction: Symptoms, Causes, Diagnosis, Treatment"
description: "Allergic reaction symptoms happen when your immune system overreacts to a trigger, from hives to anaphylaxis. Get clear next steps, labs, no referral."
canonical: "https://www.vitalsvault.com/conditions/allergic-reaction"
last-updated: 2026-08-22
---

# Allergic Reaction: Symptoms, Causes, Diagnosis, Treatment

> Allergic reaction symptoms happen when your immune system overreacts to a trigger, from hives to anaphylaxis. Get clear next steps, labs, no referral.

---

Canonical HTML: https://www.vitalsvault.com/conditions/allergic-reaction
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