Depending on the nature of the head injury and the extent of brain damage, symptoms of head injury can either be mild, moderate or severe. Some symptoms may be seen immediately following the brain injury while others might take several days or weeks to manifest.

Immediate, seen within seconds or minutes

 Loss of consciousness (In some instances, persons with head injury may remain conscious as well)

 Impaired attention, poor response to commands, speech without coherence

 Headache, confusion

 Disorientation and lack of co-ordination

The following symptoms may be seen within several hours, days or even weeks, following the accident. The presence of any of these symptoms warrants consultation with a neurologist.

Nausea/ Vomiting

Vision problems

Ringing in the ears (Tinnitus)

Fatigue, irritability, anxiety or depression

Memory retention problems

Lack of attention and concentration

Inability to tolerate loud noise

Sensitivity to bright light

Sleep Disturbances

Convulsions / Seizures

Coma

Loss of sensation in the extremities.