Asthma is a chronic (life time) disease in which your lungs and airways (breathing passages) become extra sensitive to things that you are exposed to in the environment every day.
In asthma, certain things trigger the muscles around your airways to tighten, making your airways narrower. The airway lining also becomes inflamed causing a build-up of sputum. This makes your airways even narrower. With narrow airways, it’s harder to get air in and out of your lungs and thus making it difficult for you to breathe.
Asthma can start at any age. Sometimes, people have asthma when they are very young and as their lungs develop, the symptoms go away, but it’s possible that it will come back later in life. Sometimes people get asthma for the first time when they are older.
Unfortunately, asthma can’t be cured, but if managed properly, people with asthma can lead normal active lives.