How dust mites can trigger your asthma. Consider dust mites , for example. Many people with asthma are sensitive to breathing in fecal particles from microscopic dust mites, which everyone has in their mattresses and pillows . These airborne particles are breathed in through the nose or mouth and travel to the lungs. The presence of these particles starts a chain reaction called inflammation .
Extra mucus is made and the airway swells and tightens .
Coughing, wheezing, and shortness of breath begins. In 1984, the United States Olympic team was tested for asthma. Ten percent of the athletes were found to have asthma and some didn't even know it. They went on to win as many medals as those without asthma. Many of these Olympians have a mild form of what is called exercise asthma.