Reliable detection of Win98 may not be possible. Asthma Causes Asthma symptoms can be caused by dozens of different things, and what causes symptoms in one teen might not bother another at all.
Triggers are the things that set off asthma.
Many teens who have asthma may have symptoms when they are around animals with fur, especially cats and dogs. Some other substances in the environment can be triggers because they irritate the airways just like allergens do. These include chalk dust, paint fumes, perfume, and cigarette smoke . In some people, an infection can trigger asthma - for example, if a teen with asthma gets a cold or flu infection , his airways will be much more sensitive than normal. Even cold air can sometimes be a trigger and cause certain people to have asthma symptoms.