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When you breathe, air goes in through the mouth and nose, down the windpipe, and into the lungs. Asthma is a health condition that makes it difficult to breathe. Asthma can be triggered by allergens like mold, pet dander, and dust. Stress and exercise can also trigger flare-ups. Luckily, coughing and wheezing from asthma can be controlled. Learn what to do if you or someone you know has an asthma flare-up.