system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5 why in moments of extreme fear or anxiety, you may get a metallic/bloody taste in your mouth?
gpt
High blood pressure can cause small vessels in your sinuses to burst, causing a nosebleed.  If it's only a tiny bit of blood from a really small vessel, you get the taste of blood without noticing it otherwise.