There are different grades of injury and different classification systems for the direct manifestations of the injury. Classification systems are helpful to describe the severity of the injury but may not necessarily correlate with the outcome.

For the particular instance of brain injury, manifestations range from memory loss, duration of memory loss, confusion, disorientation (duration), loss of consciousness (including duration), and comatose state.

The classification systems don't even take into consideration other manifestations such as dizziness, headache, nausea, vomiting, sensitivity to light, blurred vision, double vision and tinnitus (ringing in the ears).

Other manifestations may occur on an individual ...

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