About 70% of long lasting cough is caused by cough-variant asthma and atopic cough.
Cough-variant asthma is a type of asthma in which the main symptom is a dry, non-productive cough, but there is often no typical asthma symptoms like wheezing or shortness of breath. Coughing lasts longer than 8 weeks and sometimes a year. It is caused by the contraction of the smooth muscle in the bronchi.
Atopic cough's main symptom is a dry, non-productive cough and it lasts longer than 8 weeks like cough-variant asthma, but it is caused by over-sensitivity of the sensory nerve in the throat.
Coughing tends to increase at the following period of time
Cough-variant asthma and Atopic cough:
When starting to fall into a doze and a few hours before waking up.
Sinobronchial syndrome (complication of Chronic bronchitis and Sinusitis, wet cough and nasal mucus) :
From when you get up throughout the morning
In Eastern medicine, cough-variant asthma and atopic cough are considered as Lung deficiency or Ja in Lung, and sinobronchial syndrome is considered as Kidney deficiency.
Possibility of unexpected diseases if you have chronic cough at the following period of time,
Coughing after meal: Reflux esophagitis (acid reflux)
1 to 2 hours after going to bed: Cardiac Insufficiency
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