<human>:  What are the main signs of a concussion?
<bot>: The main signs of a concussion include: headache, confusion, memory loss, dizziness, blurred vision, slurred speech, and balance problems. Other symptoms commonly associated with a concussion may include nausea, vomiting, ringing in the ears, and sensitivity to light and noise. In some cases, people may lose consciousness or become unresponsive to stimuli. It is important to seek medical attention if any of these signs or symptoms are present.