Concussion Symptoms
Loss of consciousness after any trauma to the head
Confusion
Headache
Nausea or vomiting
Blurred vision
Loss of short-term memory (you may not remember the actual injury and the events some time before or after the impact)
Perseverating (repeating the same thing over and over, despite being told the answer each time, for example, "Was I in an accident?")
When to Seek Medical Care
Call the doctor about any of the following situations. The doctor will recommend home care, set up an appointment to see the affected individual, or send the the person to a hospital's emergency department.
A person struck a hard object with the head (for example: tile floor, ice, bathtub) but did not lose consciousness
Mild dizziness or nausea after a head injury
Loss of memory of the event (amnesia) for just a few minutes
Mild headache with no vision disturbances
Go to an emergency department by ambulance in the following situations. For people with less severe injuries not requiring ambulance transport, a car may be taken to the hospital.
Severe head trauma, for example, a fall from more than the height of the person or a hard fall onto a hard surface or object with resulting bleeding or laceration.
Any child that loses consciousness as the result of a head injury.
Prolonged loss of consciousness (longer than two minutes)
Any delayed loss of consciousness (for example, the injured person is knocked out only momentarily, then is awake and talking, then loses consciousness again)
Vomiting more than once
Confusion that does not go away quickly
Restlessness or agitation
Extreme drowsiness, weakness, or inability to walk
Severe headache
Loss of memory of the event (amnesia)
Perseverating (saying the same thing over and over)
Seizures or convulsions
Slurred speech
Someone who takes warfarin (Coumadin) or platelet inhibitors clopidogrel (Plavix) and aspirin and dipyridamole (Aggrenox) for a medical problem and suffers a significant blow to the head.
If the person fails to regain consciousness after two minutes, or the injury is very severe even if two minutes have not passed, DO NOT move the person. Prevent movement of the neck, which may exacerbate spinal injuries. If the person needs to vomit, carefully roll the person onto his or her side without turning the head. Call 911 immediately for help.
http://www.emedicinehealth.com/concussion/page3_em.htm