How can I recognize an allergic reaction?

Recognizing the signs and symptoms of an allergic reaction is crucial for prompt treatment and preventing potentially life-threatening situations. Allergic reactions can vary in severity and can affect different parts of the body. It's important to be aware of the common symptoms and to act quickly if you suspect someone is having an allergic reaction.

Common Symptoms of an Allergic Reaction:

Allergic reactions can manifest in a variety of ways. Here are some common symptoms to watch out for:

  • Skin: Hives (itchy, raised patches of skin), itching, redness, rash, swelling (especially of the face, lips, tongue, or throat)
  • Respiratory System: Wheezing, coughing, shortness of breath, difficulty breathing, runny nose, sneezing, tightness in the chest or throat
  • Digestive System: Nausea, vomiting, diarrhea, stomach cramps, abdominal pain
  • Cardiovascular System: Dizziness, lightheadedness, fainting, rapid heartbeat, low blood pressure
  • Other Symptoms: Itching or tingling in the mouth, lips, or tongue, metallic taste in the mouth, anxiety, confusion

Anaphylaxis: A Severe Allergic Reaction:

Anaphylaxis is a severe, potentially life-threatening allergic reaction that requires immediate medical attention. Symptoms of anaphylaxis can develop quickly and include: 

  • Difficulty breathing
  • Swelling of the throat or tongue
  • Wheezing or stridor (a high-pitched whistling sound when breathing)
  • Dizziness or lightheadedness
  • Fainting or loss of consciousness
  • Rapid heartbeat
  • Low blood pressure

What to Do If You Suspect an Allergic Reaction:

  • Mild Reactions: If you or someone you are with experiences mild allergic symptoms (e.g., a few hives, mild itching), you may try an antihistamine. However, it's still a good idea to contact a doctor or allergist, especially if symptoms worsen.
  • Severe Reactions (Anaphylaxis): If you or someone you are with experiences symptoms of anaphylaxis, use an epinephrine auto-injector (e.g., EpiPen) immediately if one is available. Then call emergency services (999 in the UK, 911 in the US). Even after using an epinephrine auto-injector, it's crucial to seek immediate medical attention, as a second wave of symptoms can sometimes occur.
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