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A metallic taste in your mouth after hitting your head hard can be caused by a disruption in nerve signals to your taste buds, often due to a traumatic brain injury (TBI), which can affect your sense of taste and smell; this is sometimes accompanied by other symptoms like headaches, dizziness, and confusion; if you experience this after a head injury, it's important to seek medical attention to rule out any serious complications like a cerebrospinal fluid leak.