Final answer:
A concussion is a common, mild brain injury that typically heals after a few days and is unlikely to cause permanent damage. However, serious brain injuries entail permanent damage and severe symptoms like prolonged unconsciousness and require immediate medical care.
Step-by-step explanation:
The most common type of brain injury is a concussion, which is a bruise on the brain's surface that causes temporary issues like headaches, drowsiness, and confusion. Most concussions heal on their own within a few days. While a single concussion is unlikely to result in permanent damage, repeated concussions can lead to lasting problems such as memory, learning, speech, or balance difficulties.
A serious brain injury usually results in permanent brain damage where symptoms can include prolonged loss of consciousness, profound confusion, and personality or mental ability changes. These injuries are often caused by external forces such as violent blows or jolts to the head, or an object penetrating the skull. Symptoms of severe brain injury must be treated immediately as they could result in long-term disabilities.
It's crucial not to move individuals suspected of having a back or neck injury as it could exacerbate potential spinal cord injuries and lead to paralysis.