Can a concussion from four years ago cause headaches slurred speech and clumsiness?

A concussion is a traumatic brain injury and in rare cases can cause long term effects.

However, it's unlikely that a concussion from four years ago is the sole cause of persistent symptoms like headaches, slurred speech, and clumsiness. These symptoms could be related to other underlying medical conditions or injuries that have occurred since the concussion. It's important to see a doctor to get a proper evaluation and diagnosis.