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Hi there,This is Dr Basu, experienced Internal Medicine Specialist.I am here to address your concerns and provide great service.
Sudden onset of shortness of breath can be due to the pulmonary embolism or blood clot in the lung blood vessels.
Fluid collection in the lungs from infection is another possibility.
Both these conditions can cause serious life threatening complications if not treated promptly.
Hence better to go to the ER and get a CT scan of the lungs.
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Thank you for requesting me to answer this query.What medication is he on currently?Has he had similar issues in the past?Pleural effusions and Pancreatitis may cause a similar symptoms,a physical check up and investigations to check his pulmonary and cardiac status would help.