The document discusses various symptoms of the respiratory system including cough, wheezing, stridor, sputum, hemoptysis, dyspnea, and chest pain. It provides details on the causes, characteristics, and clinical significance of each symptom. Productive cough with expectoration can be caused by lower respiratory tract infections, pneumonia, tuberculosis, bronchiectasis, or lung cancer. The document also lists differential diagnoses of hemoptysis and discusses assignment topics on symptoms of the respiratory system and productive cough.