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.
Posterior cord syndrome
It has been difficult to make any breakthroughs in diagnosis and/or treatment of PCS as symptoms are not specific in nature and can vary based on the exact location of spinal cord lesions. In addition, the demographics of patients suffering from PCS are widespread as the onset of symptoms typically follows a traumatic event. Additionally, research has suffered setbacks because PCS is extremely rare with few documented cases, unlike anterior spinal cord injury.