Hi. The truthful answer to your question is that from where I am, it would be impossible to say whether this new metallic taste is a cause for concern or not. Your husband has clearly had a horrendous few weeks. Undoubtedly he is seeing his neurosurgeon in his follow-up regime. Given that this symptom has been present for the past 4 days, I would suggest calling his consultant directly or via his secretary or registrar in order to ask this question. Your husband s neurosurgical team will have far more details into the specifics of his head injury than I have. His medical team will be only too happy to take your call. Do not feel as though you are putting them out. I hope this helps.