Early (minutes to hours):


Dizziness or vertigo

Lack of awareness or surroundings

Nausea or vomiting

Late (days to weeks):

Persistent low-grade headache


Inattention and impaired concentration

Memory disturbance

Easy fatigability

Irritability and low frustration tolerance

Intolerance of bright lights

Difficulty focusing vision

Intolerance of loud noises and tinnitus

Anxiety and depressed mood

Sleep disturbance