How can I tell if a person has a sports-related concussion?

Doug N. Cutter, MD
Sports Medicine
The number one symptom for a concussion is a headache. In this video, Douglas Cutter, MD at HCA Virginia Sports Medicine describes how sports-related concussions are diagnosed and how the progression of the injury is measured in professional sports. 
Symptoms of a concussion in sports usually show up soon after a blow to the head. However, they may be delayed for hours or even days, so close observation is warranted. Bystanders may notice a loss of consciousness after the injury. There may be a period when the player appears dazed and confused, and has a difficult time following directions and remembering what happened. The player may complain of headache, nausea or feeling dizzy or off-balance, or may complain of just not feeling right.
Dr. Darria Long Gillespie, MD
Emergency Medicine
If your child plays contact sports, you may be worried about concussions, which can have lasting effects. In this video, I will describe the signs of concussions.
UCLA Health
Administration

Less than 10% of sports-related concussions involve loss of consciousness. You can’t tell until you evaluate the athlete -- checking memory and balance and asking about symptoms. For most concussions, the main symptom is a headache. Others include dizziness and balance problems, nausea or vomiting, sensitivity to bright lights or sounds, feeling “foggy” and slow to respond to questions, and looking or acting confused. Some people experience amnesia related to the event and/or other memory problems, and some become inexplicably emotional. If you’re a player, a coach or a parent, you don’t need to make the diagnosis, but you do need to recognize these signs, and if there is any suspicion, the athlete should be removed and properly assessed.

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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.