system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why do we turn pale/green when we're sick?
gpt
because your body diverts blood away from the skin on your face and towards the areas where the infection is in order to mount an immune response against the virus or bacteria. You never actually turn "green", that's just an expression for looking unwell. Pallor (turning pale) is caused by a decrease in blood flow to certain areas.