What is causes and symptoms of asthma?

Asthma is primarily caused by a combination of genetic and environmental factors, including allergens (like pollen and dust mites), respiratory infections, air pollution, and physical activity. Symptoms typically include wheezing, shortness of breath, chest tightness, and coughing, especially at night or early morning. These symptoms can vary in intensity and may be triggered by specific irritants or allergens. Managing asthma often involves avoiding triggers and using medications like inhalers to relieve symptoms.