Asthma is a common chronic disease, especially in children under 18, with over 23 million Americans affected. The majority of children with asthma develop symptoms by age 4-5. Common symptoms include coughing, wheezing, difficulty breathing, chest tightness and pain. If properly managed with medications and avoiding triggers, asthma flares can be prevented. While the exact cause is unknown, genetics and allergies may play a role in increased risk.