Cough at night, nothing during the day. What's wrong?

Cough often at night during the day may be cold, bacterial infection or viral infection caused by bronchitis or pneumonia. Variant asthma can also lead to the same symptoms. Patients need to use cough medicine under the guidance of a doctor, usually drink more water, can eat rock candy pear or Chuanbei Loquat Lu to alleviate symptoms.