Allergies occur when the body’s defense system, called the immune system, overreacts to harmless substances known as allergens. Common allergens include pollen, pet fur, certain foods, insect stings, and some medicines. While these substances don’t bother most people, an allergic person’s immune system mistakenly treats them as dangerous invaders.
When exposed to an allergen, the immune system releases chemicals that trigger reactions in different parts of the body. These reactions can affect the skin, nose, lungs, stomach, or even the entire body. Symptoms range from mild annoyances—like sneezing or itching—to severe, life-threatening emergencies called anaphylaxis.
Common Allergy Symptoms
Depending on the allergen, reactions may include:
Hay Fever (Allergic Rhinitis)
- Sneezing, runny or blocked nose
- Itchy eyes, nose, or throat
- Fatigue and watery, swollen eyes
Food Allergies
- Tingling or swelling in the mouth, lips, or throat
- Hives (itchy red welts on the skin)
- Stomach pain, vomiting, or diarrhea
- In severe cases, anaphylaxis
Insect Sting Allergies
- Pain, swelling, and redness at the sting site
- Itching or hives all over the body
- Trouble breathing or wheezing
Medicine Allergies
- Skin rashes or hives
- Swelling of the face
- Wheezing, dizziness, or vomiting
Eczema (Atopic Dermatitis)
- Dry, itchy, cracked skin
- Red or darkened patches (may look different on darker skin)
Severe Allergic Reactions (Anaphylaxis)
Some allergies can lead to anaphylaxis—a dangerous, full-body reaction that requires immediate medical help. Warning signs include:
- Difficulty breathing or throat tightness
- Sudden drop in blood pressure
- Rapid heartbeat, dizziness, or fainting
- Severe stomach pain, vomiting, or diarrhea
- A feeling of extreme panic or doom
Can Allergies Be Cured?
While most allergies cannot be completely cured, treatments like antihistamines, nasal sprays, and allergy shots can help manage symptoms. Avoiding known allergens is the best way to prevent reactions. For severe allergies, carrying an epinephrine auto-injector (like an EpiPen) can be lifesaving.
Understanding allergies helps people recognize symptoms early and take the right steps to stay safe. If allergy symptoms are frequent or severe, consulting a doctor is the best way to find relief.