It removes the noxious stimulus that is causing you discomfort. The bad food or bacteria waste is activating sensory nerves that travel to your brain and your brain is processing the signal as discomfort/pain/annoying. When you throw up that food/waste/whatever that’s activating your sensory nerves, the nerve will no longer be activated and no longer send the signal to the brain to process so you stop processing the discomfort.
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