Asthma is a long term condition that causes your airways to narrow due to the increase in mucus and swollenness. The airways are narrow enough that it causes difficulty in the air to move freely. This can cause wheeziness or breathlessness, causing asthma attacks. This can be cured depending on the severity of the symptoms and issue.
Some symptoms are shortness of breath, Chronic coughing, trouble sleeping, Chest Tightness, etc.