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The arrows show the main forces in a concussion
CT scan, the arrows show places where bleeding occurred.
Rotational force is key in concussion. Punches in boxing deliver more rotational force to the head than impacts in sports such as American football;boxing carries a higher risk of concussion than football.[1]

Concussion is the caused by an injury to the head. It is the most common form of traumatic brain injury. Other terms include mild brain injury, mild traumatic brain injury (MTBI), mild head injury (MHI), and minor head trauma. People suffering from it are usually monitored in hospital. The main reason for this is that hemorrhage in the brain is common; this can be life-threatening.

Common symptoms include headache, dizziness, fatigue, problems with vision, and losing consciousness.

Symptoms last three to seven days in minor cases, but they usually take ten to 25 days to go away.

The main cause of concussions are accidents; in some cases, wearing a helmet can help prevent major damage.

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