Headache
Dizziness or balance problems
Nausea or vomiting
Confusion or feeling dazed
Memory problems, especially about the injury
Trouble concentrating
Blurred or double vision
Sensitivity to light or noise
Feeling unusually tired or sleepy
Slurred speech
Slowed reaction time
Mood changes, irritability, or anxiety
Loss of consciousness, even briefly
Ringing in the ears
Sleep changes
Symptoms that worsen over time
Seek urgent medical care if you have severe headache, repeated vomiting, worsening confusion, seizure, weakness, numbness, or trouble waking up