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There are many possible causes for a dry cough that lasts this long. We can go through some of them. Are you on any medications? Do you have history of allergies or asthma?
Do you experience a little tickle in your throat, or feathery sensation?
How has your energy level been during this time?
Do you suffer from acid reflux or heartburn?
That is a very common cause for chronic cough....typically underdiagnosed, or delayed diagnosed.
Stomach acid is very caustic. It tends to cause erosion, inlammation and irritation of the mucous membranes in the posterior oropharynx.
A common complaint is the sensation that "something is stuck in the throat" or there is "a ball of phlegm stuck in there."
Prognosis is good if one assiduously follows GERD precautions:
and takes an acid blocker such as prilosec every day (some require it twice daily.)
It may take several months, but cough related to acid reflux does usually go away with the proper measures.
Hope this is the case for you. If not, be sure to let your doctor know.
Do you have any additional questions?