A cough with sputum for a month is often associated with a serious infection of the respiratory system, and is more common in the lower respiratory tract. In case of bronchitis or pneumonia, which may cause a longer cough, it is best to get a sputum culture and drug sensitivity test, and according to the infection, choose a suitable and sensitive antibiotic for anti-inflammatory treatment, and use cough medicine, such as Lung Power Cough Compound, or Niubizi and Serpentine and Chuanbei Liquid, or Compound Fresh Bamboo Liquid for cough and phlegm treatment. In case of bronchiectasis or lung cancer, the cough may be prolonged and accompanied by sputum.