Question: what are the causes of a bad cough?
Answer: Clearing the throat. Coughing is a standard way of clearing your throat. ... 
Viruses and bacteria. The most common cause of a cough is a respiratory tract infection, such as a cold or flu. ... 
Smoking. Smoking is a common cause of coughing. ... 
Asthma. ... 
Medicines. ... 
Other conditions.