Asthma Uncovered: A Comprehensive Look at Epidemiology, Pathophysiology, and Diagnosis

Asthma is the most common chronic respiratory disease in children. Advances in understanding its pathophysiology, along with emerging therapies and updated treatment strategies, underscore the importance of staying current with evidence-based care. However, many primary care professionals may still rely on outdated guidelines.After completing this article, readers should be able to: Describe the underlying pathophysiology of asthma.Identify key clinical and diagnostic features of asthma in children and adolescents.Recognize other conditions in the differential diagnosis of asthma.Asthma affects nearly 5 million children and over 20 million adults in the United States (US), making it one of the leading chronic diseases.1 Asthma is characterized by chronic airway inflammation and reversible obstruction triggered by factors such as allergens, infections, and irritants. Signs and symptoms include wheezing, shortness of breath, chest tightness, and coughing, which can vary in severity. Asthma is controllable through trigger avoidance and by adhering to appropriate medical care.Guidelines, including those from the National Heart, Lung, and Blood Institute (NHLBI) and Global Initiative for Asthma (GINA), offer evidence-based recommendations for the diagnosis and management of asthma.2–4 Key updates include single maintenance and reliever therapy (SMART) with inhaled corticosteroid-formoterol combination inhalers. Additionally, there are several predictive tools and diagnostic tests that can assist the provider in identifying asthma.Despite the availability of guidelines, predictive tools, and effective treatments, asthma imposes a significant burden on patients, caregivers, schools, and the health care system. Asthma-related costs in the US—including missed school and work, health care expenses, and mortality—exceed $80 billion annually.5 Over the next 20 years, uncontrolled asthma is projected to contribute an estimated $964 billion in additional costs.6 Racial and ethnic disparities persist, with Non-Hispanic Black children and those with lower socioeconomic status experiencing more severe asthma symptoms.7,8 Clearly, there is much more to be done to reduce the impact of asthma.According to the most recent data from the Centers for Disease Control and Prevention (CDC), asthma affects one in every 12 children aged 0 to 17 years, which amounts to over 4.6 million children in the US.8 In childhood, asthma prevalence is higher among males (9%) than females (7%), whereas in adulthood, both the prevalence and severity are greater among women.9,10 Asthma prevalence shows significant disparities, with higher rates among children with limited resources, those in urban areas, and specific racial and ethnic groups. Asthma is more common in children ≥5 years (10%) compared with those