Respiratory diseases are conditions that affect the lungs and airways, making it difficult to breathe. Common examples include asthma, chronic obstructive pulmonary disease (COPD), and pneumonia. These diseases can be caused by various factors, including infections, environmental pollutants, and smoking. Symptoms of respiratory diseases often include coughing, wheezing, shortness of breath, and chest tightness. Diagnosis typically involves physical examinations, imaging tests like X-rays, and lung function tests. Treatment may include medications, lifestyle changes, and in some cases, surgery to improve breathing and overall lung health.