Hello and Welcome to ‘Ask A Doctor’ service. I have reviewed your query and here is my advice. Yes, it may be due to barium. It is a mechanism through which body is excreting out barium. If you feel nauseated and frequent burping, then you can take a Proton Pump Inhibitors (PPIs). Hope I have answered your query. Let me know if I can assist you further. Regards, Dr. Somaiya Sultana