🌟 What is an Allergy?
An allergy is when the immune system reacts too strongly to a substance that is normally harmless.
These substances are called allergens.
🧬 Key Terms
- Allergen: A trigger substance (pollen, food, dust, animal dander)
- Immune response: The body’s defence system reacting
- IgE antibodies: Special immune proteins involved in allergic reactions
- Histamine: A chemical released that causes allergy symptoms
⚙️ How Allergies Work
When a person is exposed to an allergen:
- The immune system mistakes it as harmful
- IgE antibodies are produced
- Mast cells release histamine
- Symptoms appear (swelling, itching, inflammation)
⚠️ Types of Hypersensitivity Reactions
🔴 Type I (Immediate)
- Fast reaction
-
Includes:
- Hay fever
- Asthma
- Anaphylaxis
🟠 Type II (Cytotoxic)
- Immune system attacks body cells
- Example: Blood transfusion reactions
🟡 Type III (Immune Complex)
- Antibody complexes build up in tissues
- Causes inflammation
🔵 Type IV (Delayed)
- Slower reaction (hours–days)
- Example: Poison ivy rash
🌍 Common Allergens
🌿 Environmental
- Pollen
- Dust mites
- Mold
- Animal dander
🍞 Food Allergens
- Peanuts
- Tree nuts
- Milk
- Eggs
- Shellfish
- Wheat
- Soy
🧴 Other Triggers
- Latex
- Insect stings
- Medications
🚨 Anaphylaxis (Emergency Reaction)
Anaphylaxis is a severe, life-threatening allergic reaction.
⚠️ Symptoms:
- Difficulty breathing
- Swelling of lips, tongue, or throat
- Low blood pressure
- Hives (rash)
- Vomiting
💉 Treatment:
- Immediate epinephrine (adrenaline) injection
- Emergency medical care
🔍 Diagnosis
Doctors may use:
- Skin prick tests
- Blood tests (IgE levels)
💊 Treatment Options
🧴 Antihistamines
- Reduce sneezing, itching, and runny nose
💊 Leukotriene blockers
- Reduce inflammation and congestion
💉 Epinephrine
- Used for emergency anaphylaxis
🚫 Avoidance
- Identifying and avoiding allergens is key
🧠 Key Takeaways
- Allergies can develop at any age
- The immune system reacts to harmless substances
- Some reactions are mild, others are life-threatening
- Management includes avoidance, medication, and emergency treatment
🧩 Nursing / Care Focus
- Identify triggers early
- Monitor breathing and airway risk
- Act quickly in severe reactions
- Educate patients about allergen avoidance
🧠 Easy Read Summary
- Allergies are when the body reacts too strongly
- Triggers are called allergens
- Symptoms can include itching, swelling, or breathing problems
- Severe allergies can be dangerous (anaphylaxis)
- Treatment includes avoidance and medication
❤️ Key Message
Allergies are:
- Common
- Manageable
- Sometimes life-threatening
- Important to recognise early
⚠️ Disclaimer
This information is for education only. Always seek medical advice for diagnosis or treatment.
📘 Understanding Allergic Reactions
Allergic reaction happens when the immune system overreacts to a harmless substance (called an allergen), such as pollen, food, or pet dander.
👉 The body treats the allergen as a threat and releases chemicals like histamine, causing symptoms.
🧠 What Happens in the Body?
- The immune system produces IgE antibodies
- These trigger the release of histamine and other chemicals
-
This leads to inflammation affecting:
- Skin
- Airways
- Digestive system
🌼 Common Triggers (Allergens)
- 🌿 Pollen (hay fever)
- 🐶 Pet dander
- 🏠 Dust mites
- 🍄 Mold
- 🍽️ Foods (nuts, milk, shellfish, eggs)
- 🐝 Insect stings
- 💊 Medications
🤧 Common Symptoms
Mild to Moderate Symptoms
- Sneezing
- Runny or blocked nose
- Itchy, watery eyes
- Skin rash or itching
- Hives (raised, red bumps)
- Coughing or wheezing
- Stomach cramps or nausea
🚨 Severe Reaction: Anaphylaxis
Anaphylaxis is a life-threatening emergency.
⚠️ Symptoms of Anaphylaxis
- Difficulty breathing or wheezing
-
Swelling of:
- Throat
- Tongue
- Lips
- Rapid drop in blood pressure
- Dizziness or fainting
- Rapid or irregular heartbeat
👉 This can happen within minutes of exposure
📞 When to Seek Emergency Help
Call 911 immediately if someone has:
- Trouble breathing
- Swelling of face or throat
- Feeling faint or confused
- Severe or rapidly worsening symptoms
👉 Use an epinephrine injector if available
🔍 Common Types of Allergic Conditions
🌼 Allergic Rhinitis (Hay Fever)
- Sneezing, congestion, itchy eyes
🌬️ Allergic Asthma
- Breathing difficulties triggered by allergens
🧴 Contact Dermatitis
- Skin reaction from touching allergens
- Rash, redness, or blisters
🍽️ Food and Drug Allergies
- Can affect the whole body
- May lead to severe reactions
🧪 Diagnosis
Doctors may use:
- Skin prick tests
- Blood tests
👉 These help identify specific allergens
💊 Treatment and Management
🚫 Avoidance
- The most effective strategy
- Identify and avoid triggers
💊 Medications
- Antihistamines (reduce symptoms)
- Decongestants (relieve nasal congestion)
- Steroids (reduce inflammation)
💉 Emergency Treatment
-
Epinephrine (for severe reactions)
👉 Must be used immediately in anaphylaxis
🛠️ Daily Management Tips
- Know your triggers
- Carry medication if prescribed
- Read food labels carefully
- Inform schools/workplaces about severe allergies
- Wear a medical alert bracelet if needed
💡 Key Messages
- Allergies are common and manageable
- Reactions can range from mild to life-threatening
- Early recognition of severe symptoms can save lives
🧾 Summary
Allergic reactions involve:
- Immune system overreaction
- Triggers like food, pollen, or animals
- Symptoms from sneezing to severe breathing problems
- Treatments including avoidance, medication, and emergency care
👉 Understanding allergies helps people stay safe and respond quickly
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