Our expert says:
Yes, it is imperative for your father to consult a doctor. Cancer of the oesophagus is obviously a possibility and will have to be excluded. The doctor will refer your father for a gastroscopy and barium meal to determine where the obstruction is. It is also possible that he is suffering from benign severe gastric reflux with irritation of the food pipe.
Keep me posted about the findings and I sincerely hope that it is nothing serious.
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