There are a multitude of assessment methods for concussions, each other which get at different potential impact domains (cognitive, psychological, biological). Some common tests include:
- Post-Concussion Symptom Scale (PCSS)
- Standard Assessment of Concussion (SAC)
- Standard Concussion Assessment Tool (SCAT3)
- Immediate Post-Concussion Assessment and Cognitive Testing (ImPACT) 

Concussion symptom assessment

- Headache
- Ringing in the ears
- Nausea
- Vomiting
- Fatigue or drowsiness
- Blurry vision
- Light sensitivity
- Sleep disturbances

Scripps College

Also called minor traumatic brain injury (mTBI). An injury resulting from a blow to the head and associated with temporary neurological symptoms such as memory loss or other cognitive impairments, pain, and visual disturbances.

Concussion

https://www.mayoclinic.org/diseases-conditions/concussion/symptoms-causes/syc-20355594

Concussion symptoms

Champagne, A. A., Coverdale, N. S., Fernandez-Ruiz, J., Mark, C. I., & Cook, D. J.. (2021). Compromised resting cerebral metabolism after sport-related concussion: A calibrated MRI study. Brain Imaging and Behavior, 15(1), 133–146. https://doi.org/10.1007/s11682-019-00240-2

Compromised resting cerebral metabolism after sport-related concussion

Concussion Library

In addition to the physical and cognitive symptoms of concussions, anxiety and depression are prevalent post-concussion, being reported as the primary symptom in about 30% of sport-related concussions.

Psychological impacts of concussions

Physical impacts of concussions

- Concentration and memory complaints
- Irritability and other personality changes
- Forgetfulness, such as repeatedly asking the same question
- Slowed processing speeds
- Confusion
- Potential for amnesia of the traumatic event

Cognitive impacts of concussions

It is estimated between 1.6-3.8 million sports-related concussions occur annually, with 30% occurring in youth male American football athletes.

Concussions and American Football

In collision-sport athletes, brain metabolism is negatively impacted throughout the course of a season due to mild head injuries even if a concussion is not known to have occurred. 

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