Classification

Perennial and seasonal-

Perennial allergies are symptoms that occur throughout the year.  They are usually brought on by a specific allergen or allergens in the home such as pets, mold, and dust. 

Seasonal allergies take place during a specific time to a specific allergen such as molds, pollen from trees, grass and weeds. 

Intermittent versus persistent and mild versus moderate/severe-

Intermittent allergies are symptoms lasting less than 4 weeks. 

Persistent symptoms occur more than four days per week and symptoms last longer than 4 weeks.   

Mild symptoms do not interfere with sleep, daily activities, work or school and do not cause any troublesome symptoms. 

Moderate/severe symptoms are associated with at least one of the following: abnormal sleep, troublesome symptoms, problems at work or school or impairment in daily activities.

10 most common allergens as outlined by Health Canada  include-

      Peanuts
      Tree-nuts
      Milk
      Eggs
      Soy
      Wheat
      Sesame
      Shellfish
      Fish
      Sulphites (not a food, but an additive)