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-concussion syndrome
While the causes of symptoms occurring immediately after a concussion are likely to be physiological, it is less evident that persistent post-concussive symptoms have an entirely organic basis, and nonorganic factors are likely to be involved in symptoms that last longer than three months. PCS may also be exacerbated by psychosocial factors, chronic pain, or an interaction of some or all of these. The majority of experts believe that PCS results from a mix of factors, including preexisting psychological factors and those directly relating to the physical injury.