You may also feel short of breath and get a tight feeling in your chest. This is because your lungs are having to work extra hard to get air through the narrowed airways. You may find that you wheeze or make a whistling sound when you breathe. This is because the air in your lungs is being forced through a narrower tube - rather like air escaping from the neck of a balloon. Asthma is a very variable condition.
Symptoms range from very mild to very severe.
Loads of people have asthma. In fact, around 150 million people around the world have the condition, so you are not alone. And many of them are teenagers just like yourself. You can't catch asthma - it is not an infectious disease. You may have asthma because you have inherited it.