The causes of asthma are different for everyone. The key is being aware of your environment and recognizing where you are and what you are exposed to when you feel the onset of asthma symptoms.

Asthma triggers can be divided into four key categories: indoor, outdoor, irritants, and other causes. Knowing each of these causes along with its location can help you better prevent asthma and its symptoms.

Indoor asthma symptoms can be triggered by a variety of  allergens. Common allergens include dust, pets, mice or rats, mold, and insects. To alleviate indoor allergens, be sure to vacuum often, dust frequently, and locate damp, mold prone areas of your home.
When outdoors, asthma symptoms are usually triggered seasonally and become most prominent during the spring and summer months. Common allergens and triggers include pollen, trees, grass, and weather changes. To alleviate symptoms, consider purchasing an air purifier/filter, stay indoors in an air conditioned room (during high pollen count days), and sleep with the windows closed.

Common indoor and outdoor irritants can also trigger asthma symptoms. Common allergens and triggers include smoke and strong smells such as cleaning products, paint, perfumes, and air fresheners. To alleviate symptoms, avoid smoking or people who smoke. Also be aware of which strong smells can trigger your asthma symptoms.

Asthma symptoms aren’t just triggered by indoor, outdoor, and irritant triggers. Other activities and allergens can also trigger your asthma. Common triggers include stress, exercise, a cold or infection, and food allergies. Knowing how to cope with stress, being careful not to overexert yourself when exercising, avoiding products that can contain a food allergy, and recognizing cold symptoms can help avoid an asthma attack.
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