I have a question on blood?

Can someone help me understand why vomiting blood can contribute to having more nausea. I thought it would be because of the metalic taste of it but my teacher says that is the wrong answer. I am looking in my book and have done internet searchs and cannot find anything. Can someone direct me in the right direction please. Thanks so much.

Jessica

[Achoo!, LPN]

Maybe because it offsets the ph?

[talaxandra]

Having blood in the stomach causes nausea and vomiting, so maybe it's that rather than vomiting it up that she means.