Asthma is a chronic inflammation of the airways that affects millions of adults and children in the U.S. It is caused by triggers like dust, pollen, pet hair, or tobacco smoke that bring about symptoms like wheezing, shortness of breath, and coughing. While asthma cannot be passed between individuals, chronic coughing may impact transmission of other illnesses. The disease affects the bronchial tubes leading to the lungs and symptoms are often worse in the morning or evening in response to cold air. Preventative inhalers can help control symptoms and attacks to manage the disease, which is lifelong once developed, though its effects can be minimized with proper treatment.