Asthma is a lung disorder that causes inflammation in the airways, or bronchial tubes, making it difficult to breathe. This narrowing causes coughing, shortness of breath, tightness in the chest and wheezing. It’s estimated that asthma affects 26 million people in the United States. As a physician, I’ve noticed that for such a common disease, there seems to be a lot of misconceptions about the condition. From what you should do if you have asthma to who can get it, here are some of the biggest myths I’ve heard about the disorder and the actual facts.