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.
Sports-related traumatic brain injury
There are five major features in conjunction with the definition:Signs and symptoms of concussions can be hard to determine because they may not present strongly and because they may not present for several hours after the incident has occurred. There are 4 categories that symptoms of a concussion can be classified within: physical, cognitive, emotional and sleep disturbance. The most common symptom is a headache as well as the feeling of being “fog like”. Other, more subtle symptoms that can accompany headaches are emotional changes, irritability, slowed reaction times and drowsiness. Accompanying symptoms can include sensitivity to light, and noise, fatigue, dizziness, nausea and vomiting. The loss of consciousness is another identifiable characteristic of concussions but it is not a required symptom to diagnose it. The loss of consciousness occurs in only 10% of concussions, so it cannot be a reliable sign of a concussion. Other distinguishing characteristics of concussions are retrograde amnesia (loss of memory just prior to injury) and posttraumatic amnesia (impaired recall of time between the injury or resumption of consciousness and the point at which new memories are stored and retrieved).