Nauseas and Vomiting Download PDF, 525KB, PDF Nausea is the sensation you get when you think you might throw up.Vomiting is when you throw up (some or all of the cotents in your stomach come out through your mouth).Somtimes, people feel nauseous without throwing up, and somtimes people throw up without feeling nauseous first. Often, these tow can happen together. [Please download the PDF file if you are unable to view the image below.]