system
Given the following post, respond as if you're commenting on Reddit:
human
Why does vomiting relieve nausea even when the nausea is not caused by something in your digestive tract?

For example, nausea caused by drug use via insufflation or unsettling images.
gpt
Nausea is a response due to cues that evolution has shown our biology to be indicators of something you've ingested being toxic. The relief of nausea from throwing up isn't necessarily connected to the cessation of those cues, just trying sensation of your vomiting. Which leads to the awkward situation of you throwing up but the nausea returning because the cue causing it wasn't related to what's in your stomach.