Chronic cough has a variety of causes. Nasal disease, chronic bronchitis, and bronchial asthma can all cause cough. To cure chronic cough, you should first treat the disease causing the cough. 1. Due to nasal diseases, there is an increase in secretions in the nose. These substances enter the throat through the nasal passages and cause coughing. Patients with chronic cough from this cause have a cough that worsens when they lie on their backs. Nasal diseases need to be treated persistently and you should not take medication for a period of time and then stop taking it after seeing a slight improvement. 2. Chronic bronchitis can trigger a chronic cough, which mostly occurs in older people. Usually, such patients have an annual onset of up to three months or more, accompanied by coughing sputum. Currently, this disease is treated by oral or inhaled medication. 3. There is a specific type of asthma that causes a chronic cough, namely cough variant asthma. The pathogenesis of this type of asthma is the same as that of typical asthma. These patients have a predominantly dry cough that worsens in the morning and at night, and can be treated as asthma. Chronic cough is longer, with patients coughing for more than 8 weeks. If you find that your cough cannot be cured, you should suspect whether it is a chronic cough and have a detailed examination.