Table 1.

Post-concussion symptom clusters [23]

Migrainea	Cognitive	Sleep	Neuropsychiatric
Headaches	Fatigue	Difficulty sleeping	More emotional
Visual problems	Mental fogginess	Sleeping more than usual	Sadness
Dizziness	Drowsiness	Sleeping less than usual	Nervousness
Sensitivity to light	Difficulty concentrating		Irritability
Sensitivity to noise	Difficulty remembering
Nausea	Feeling slowed down cognitively
Vomiting
Balance problems
Numbness or tingling

^aEach item is graded from 0 (asymptomatic) to 6 (severely symptomatic)