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How long has this been going on?
How old is he?
Does he have any fevers or rashes?
Does he smoke?
Does he have any hoarseness in his voice?
Thank you for your patience and the answers.
With smoking, there is always risk of esophageal cancer, especially in middle age men.
Difficulty swallowing that has been going on for only a couple of months is very concerning for this.
The first step is to visualize the esophagus with an upper endoscopic procedure (called EGD) - not only pictures, but biopsy of the affected and/or questionable areas can be taken and sent off to lab for analysis.
There is also a stretching procedure that you refer to, but the most important thing at first would be to see what the cause of this is, and to make sure it is not malignant.
Meanwhile, encourage him to stop smoking.
He should be evaluated by Gastroenterology.
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