Asthma: A disease that affects a person’s lungs and can make it difficult to breathe. Many factors can trigger an asthma attack. For some people, these triggers may include air pollution, allergens, heavy exercise, or certain weather conditions.
Asthma: A disease that affects a person’s lungs and can make it difficult to breathe. Many factors can trigger an asthma attack. For some people, these triggers may include air pollution, allergens, heavy exercise, or certain weather conditions.