Asthma is a lung condition that can make your airways narrow, swell, and produce extra mucus, which causes breathing difficulties. Asthma affects around 18.4 million adults Trusted Source and 6.2 million children in the United States.
Some individuals may eventually grow out of asthma, while for others it is a life-long condition. Asthma can be a significant problem that interferes with daily life and may lead to an asthma attack, which can be life-threatening.