Below is an instruction from Human. Write a response.
    ### Instruction:
    What are the symptoms of COPD ?
    ### Response:
    Common Symptoms The most common symptoms of COPD are -  a cough that does not go away   - coughing up lots of sputum (mucus).  a cough that does not go away coughing up lots of sputum (mucus). These symptoms often start years before the flow of air in and out of the lungs is reduced.
    