Can you go unconscious when you get a concussion?

Not necessarily: Concussion is defined as altered mental status following a head injury, i.e. Confusion, tiredness, headache, vomiting and dizziness are common. Loss of consciousness is not necessary to diagnose a concussion. There are many symptoms that are more important indicators.

Concussion: Having a concussion does not necessarily mean one goes unconscious but if a patient does loss consciousness due to a concussion this is a serious head injury and needs to be evaluate.

Possibly: It is certainly possible to lose consciousness from a head injury. But loss of consciousness is not mandatory to make a diagnosis of concussion. Its best if you get checked by your doctor.