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Hello from JustAnswer.
It will help if you could provide some further information.
How long has this been bothering you?
Are you having any shortness of breath?
Do you smoke?
I had asked for some additional information and have not heard back.
If the chest congestion is of short duration, then the most likely cause would be a viral bronchitis, an infection of the airways of the lung. In this situation, the usual approach would be symptomatic relief until the virus resolves spontaneously.
If the chest congestion is of linger duration, then it would be more likely due to chronic bronchitis. In a non-smoker, the most common cause would be from allergies or acid reflux. In a smoker of many years duration, then it would most likely be from chronic irritation of the airways from the cigarette smoke, a sub-type of chronic obstructive pulmonary disease. In these situation, treatment would depend upon the underlying cause that is identified.
If I can provide any clarification, please let me know.