Table 1.

Commonality Symptoms of Concussion and Cervicogenic Injury

Symptom	Condition
	Concussion	Cervical Injury
Headache3,10,15,16–19	X	X
Dizziness3,10,16–20	X	X
Tinnitus10	X	X
Irritability10,21	X	X
Chronic traumatic encephalopathy3	X
Sleep disturbances3,10,17	X	X
Blurred vision10,17	X	X
Neck stiffness10,18	X	X
Balance disturbances13–17,20,21	X	X
Depression2,3	X
Cognitive deficits10,17,21,22	X	X
Memory deficits10,17,18,21,22	X
Attention deficits10,17,18,21,22	X	X
Decreased cervical range of motion18		X
Decreased isometric neck strength18	X	X