You may feel fine within a few hours after the head injury. You may still have brain damage even if you did not lose consciousness. It may take weeks for signs of brain damage to happen. If you get confused, shaky, or are worried, go to the ER or call your doctor.,A brain injury may cause changes in a person's way of life. These changes may include a different level of consciousness, being unaware of surroundings, and not able to respond to things around you. Other changes may include: Damage to the brain. This may lead to changes in mental, physical, and emotional behavior. These changes may last for a short time or may last forever. Trouble with memory, learning, or judgment Problems in communicating that could lead to frustrations, conflicts, and more injuries Changes in actions and feelings that cause anger or low mood most of the time Problems with hearing, smelling, or eyesight Seizures Higher chance for other brain diseases, such as Alzheimer and Parkinson,Damage to the brain. This may lead to changes in mental, physical, and emotional behavior. These changes may last for a short time or may last forever.,Trouble with memory, learning, or judgment,Problems in communicating that could lead to frustrations, conflicts, and more injuries,Changes in actions and feelings that cause anger or low mood most of the time,Problems with hearing, smelling, or eyesight,Seizures,Higher chance for other brain diseases, such as Alzheimer and Parkinson