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Asthma is generally divided into two categories: intrinsic and extrinsic asthma. Intrinsic asthma is triggered by something "inside" the body, including exercise, infection and even emotions such as laughing, crying or distress. Extrinsic asthma, also known as atopic or allergic asthma, is triggered by substances "outside" the body. These allergens are often the same substances that cause seasonal allergies, such as pollen, grass and ragweed. Here's how to handle them both.
There are actually two main causes of allergy symptoms: indoor and outdoor triggers. While most people understand seasonal (outdoor) allergies are caused by pollen in the air, there are a number of factors that contribute to indoor allergies, which can affect people year-round. Symptoms can be similar, but it's important to remember indoor and outdoor allergies are caused by different sources, and therefore should be managed differently.
Seasonal allergies affect 20 to 30 per cent of Canadians.