Thanks for this question. Well there are a couple of things here, the CT scan which you have mentioned is essentially normal in every respect apart from the minimal scarring which could have occurred due to inflammation in the area occurring over the years. Now chronic bronchitis would have shown up in the CT scan as well unless it is in the very early stages, since it hasnt then iteither means that you have very mild chronic bronchitis or you have another problem other than bronchitis. If you do have bronchitis, then it would be classified as COPD as chronic bronchitis is considered as a part of COPD. The symptoms do suggest that you have chronic bronchitis but since the CT scan is normal it is not very severe, in such a scenario the prognosis is very good and with adequate care you should live a normal life. This would be better diagnosed with spirometry and a xray of teh chest. Another diagnosis which should be considered is asthma which can cause the symptoms which you are mentioning, it should be looked into as a cause as well.
One last thing which should be considered is GERD or acid reflux which can cause the coughing, phlegm especially after eating and after waking up in the morning. A simple way to check if this is the case would be to start using OYTC prilosec which should help with the symptoms and if needed an endoscopy can be done to confirm the diagnosis.
In short i dont believe that you have chronic bronchitis but even if you do, it is in the early stages which can be managedeasily. Chronic bronchitis is considered as a part of COPD. But do get evaluated for GERD and asthma as well/
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