Post-concussion syndrome
About 10% of people with PCS develop sensitivity to light or noise, about 5% experience a decreased sense of taste or smell, and about 14% report blurred vision. People may also have double vision or ringing in the ears, also called tinnitus. PCS may cause insomnia, fatigue, or other problems with sleep.
Post-traumatic seizure
PTS is associated with a generally good prognosis. It is unknown exactly how long after a TBI a person is at higher risk for seizures than the rest of the population, but estimates have suggested lengths of 10 to over 15 years. For most people with TBI, seizures do not occur after three months, and only 20–25% of people who suffer TBI have PTS more than two years after the injury. However, moderate and severe TBI still confer a high risk for PTS for up to five years after the injury.