What is a common sign of a concussion?

A common sign of a concussion includes loss of consciousness. Concussions are classified as mild traumatic brain injuries that can occur due to a blow to the head or violent shaking of the head and body. While not every concussion leads to loss of consciousness, it is a significant symptom that indicates a disturbance in normal brain function. This symptom may manifest immediately after the injury or even hours later and is often accompanied by other signs such as confusion, headache, dizziness, or balance problems.

In the context of this question, loss of consciousness serves as a notable indicator of a concussion, highlighting the injury's severity. Awareness of this symptom can aid healthcare professionals and coaches in making decisions about the individual's fitness to continue participating in sports or other activities.