how are concussions caused
The signs and symptoms of a concussion can be subtle and may not show up immediately. Symptoms can last for days, weeks or even longer. Common symptoms after a concussive traumatic brain injury are headache, loss of memory (amnesia) and confusion. The amnesia usually involves forgetting the event that caused the concussion. Signs and symptoms of a concussion may include: Headache or a feeling of pressure in the head. Temporary loss of consciousness.