16/03/2022
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Allergies occur when your immune system reacts to a foreign substance — such as pollen, bee venom or pet dander — that doesn't cause a reaction in most people.
Your immune system produces substances known as antibodies. Some antibodies protect you from unwanted invaders that could make you sick or cause infection.
When you have Allergies, your immune system makes antibodies that identify a particular allergen as harmful, even though it isn't. When you come into contact with the allergen, your immune system's reaction can inflame your skin, sinuses, airways or digestive system.
The severity of Allergies varies from person to person and can range from minor irritation to Anaphylaxis — a potentially life-threatening emergency. While most Allergies can't be cured, a number of treatments can help relieve your allergy symptoms.
SYMPTOMS
Allergy symptoms depend on the substance involved and can involve the airways, sinuses and nasal passages, skin, and digestive system. Allergic reactions can range from mild to severe. In some severe cases, Allergies can trigger a life-threatening reaction known as Anaphylaxis.
Hay fever, also called allergic Rhinitis, may cause:
Sneezing
Itching of the nose, eyes or roof of the mouth
Runny, stuffy nose
Watery, red or swollen eyes (conjunctivitis)
A Food allergy may cause:
Tingling mouth
Swelling of the lips, tongue, face or throat
Hives
Anaphylaxis
An insect sting allergy may cause:
A large area of swelling (Edema) at the sting site
Itching or hives all over your body
Cough, chest tightness, wheezing or shortness of breath
Anaphylaxis
A Drug allergy may cause:
Hives
Itchy skin
Rash
Facial swelling
Wheezing
Anaphylaxis
Atopic Dermatitis, an allergic skin condition also called eczema, may cause skin to:
Itch
Redden
Flake or peel
Anaphylaxis
Some types of Allergies, including Allergies to foods and insect stings, have the potential to trigger a severe reaction known as Anaphylaxis. A life-threatening medical emergency, this reaction can cause you to go into Shock. Signs and symptoms of Anaphylaxis include:
Loss of consciousness
A drop in blood pressure
Severe shortness of breath
Skin rash
Lightheadedness
A rapid, weak pulse
Nausea and vomiting