Allergy Symptoms and types of Allergies

ALLERGIES: ALLERGY SYMPTOMS
Allergy symptoms can be categorized as mild, moderate, or severe.

Mild Allergic Reactions

Mild allergic reactions can include:

Rash
Itchy, watery eyes
Congestion

Mild reactions do not spread to other parts of the body.
2. Moderate Allergic Reactions
Moderate reactions can include symptoms that spread to other parts of the body,
including:

Itchiness
Difficulty breathing

Severe Allergic Reaction (Anaphylaxis)
Anaphylaxis is a rare, [...]

What is Allergy how does it cause

Allergy is a disorder of the immune system often also referred to as atopy. Allergic reactions occur to environmental substances known as allergens; these reactions are acquired, predictable and rapid. Strictly, allergy is one of four forms of hypersensitivity and is called type I (or immediate) hypersensitivity.
It is characterized by excessive activation of certain white [...]