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I don't want to suggest that everyone who hits their head needs to go get a [ computed tomography also known as a CT or CAT) ] scan, most do not need that obviously. But if it's a significant blow, you're on blood thinners... and again those symptoms : worsening headaches, confusion, nausea, vomiting, slurring of speech, things like that are unusual. You should definitely go get that checked out.