Is a metallic taste a symptom of anything if you have a concussion?

I lost an argument with a piece of furniture early Tuesday morning while sleepwalking. I went to the ER for stitches, but I didn’t have concussion symptoms until yesterday. I’ve been in touch with my doctor each day and I go back Monday for revaluation and get the stitches out. I’ve got all the usual symptoms, plus I’m getting a metallic taste in my mouth the last two days. This isn’t a bad concussion, maybe a 1.5 to 2 on a scale of 1 to 5. What would cause that taste?