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

Yes, a concussion can cause ongoing problems with memory, coordination, cognition, language, speech, etc. Depending on the location and severity of the lesion. Concusions, or Mild Traumatic Brain Injuries (mTBI) are more serious than most people believe; though less severe than stroke or TBI, they can and often do cause lingering symptoms If these symptoms are NEW, it is of upmost importance to get medical assistance immediately; however, if they have been present since the initial injury, consult your primary physician or neurologist and ask for a referral to physical and speech therapy- both would be beneficial in your case Hope this helps!

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