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Is it bad for your brain if you become unconscious?

I got hit in the head and blacked out four days ago. I feel fine now. Is it bad for your brain to be unconscious though? It was only a few seconds according to my friend. Should I have my brain scanned or something?
A brief loss of consciousness is very common after a head injury. If you were on a blood thinner like Plavix or coumadin, you might need to get a head CT scan after the incident. But it has been 4 days and if you do not have signs or symptoms of neurological deficits, then it is probably an over-kill to get a head scan at this time. These are some examples of neurological symptoms that a person might have with a brain injury: visual changes, numbness or tingling on one part of the body, weakness or lack of sensation on one side of the body. There may not be any significant lesions on the brain scan in head injuries severe enough to cause a loss of consciousness. But there may be some possibilities that there are injuries to the neural circuit at the micro level. Regardless, after such an injury you may expect to have concussive symptoms which can be quite severe sometimes. These symptoms can include headaches, dizziness, poor memory and cognitive symptoms. These symptoms get better over time. When they recur it is important to rest and decrease noise, lights, and other types of stimulation. Your brain just needs a quiet break. Some people may need to take time out from work or school because these activities trigger an attack. I would recommend that you visit a primary care physician to be properly evaluated.
This answer is for general informational purposes only and is not a substitute for professional medical advice.
If you think you may have a medical emergency, call your doctor or (in the United States) 911 immediately. Always seek the advice of your doctor before starting or changing treatment. Medical professionals who provide responses to health-related questions are intended third party beneficiaries with certain rights under Zocdoc’s Terms of Service.

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