Asthma Asthma is a chronic lung condition that affects the airways - the tubes that carry air in and out of the lungs. When asthma is not well controlled, the airways can become swollen, narrow, and filled with mucus. This can make breathing harder and may lead to coughing, wheezing, chest tightness, or shortness of breath. Asthma can often be managed well with the right treatment plan, trigger control, and regular follow-up. However, asthma symptoms should always be taken se