What causes the metal taste in your mouth after a head impact/bump?

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Recently, I accidentally head butted a large piece of furniture during a move. I’m not sure if the “taste of Metal” is the exact proper description, but if you hit your head hard enough there is a distinct taste that develops in your mouth and teeth immediately after. What is this, and what causes it?

In: Biology

Iron, the haemoglobin and myoglobin in your body can be forced out and be tasted, both of these contain substantial amounts of iron.