Some signs or symptoms may appear immediately after the traumatic event, while others may appear days or weeks later.The signs and symptoms of mild traumatic brain injury may include:Moderate to severe traumatic brain injuries can include any of the signs and symptoms of mild injury, as well as these symptoms that may appear within the first hours to days after a head injury:Infants and young children with brain injuries might not be able to communicate headaches, sensory problems, confusion and similar symptoms. Different states of consciousness include:It's possible that a vegetative state can become permanent, but often individuals progress to a minimally conscious state.Sometimes, any or several of these symptoms might linger for a few weeks to a few months after a traumatic brain injury. These may include:Research suggests that repeated or severe traumatic brain injuries might increase the risk of degenerative brain diseases. More-serious traumatic brain injury can result in bruising, torn tissues, bleeding and other physical damage to the brain. A mild injury to the brain is still a serious injury that requires prompt attention and an accurate diagnosis.Traumatic brain injury is usually caused by a blow or other traumatic injury to the head or body. It may be more difficult to focus and take longer to process your thoughts. Traumatic brain injury usually results from a violent blow or jolt to the head or body. This is currently referred to as persistent post-concussive symptoms.

Any use of this site constitutes your agreement to the Terms and Conditions and Privacy Policy linked below. Traumatic brain injury usually results from a violent blow or jolt to the head or body. These injuries can result in long-term complications or death. Severe injuries increase the risk of a greater number and more-severe complications.Moderate to severe traumatic brain injury can result in prolonged or permanent changes in a person's state of consciousness, awareness or responsiveness. An object that penetrates brain tissue, such as a bullet or shattered piece of skull, also can cause traumatic brain injury.Mild traumatic brain injury may affect your brain cells temporarily. © 1998-2020 Mayo Foundation for Medical Education and Research (MFMER). "Mayo," "Mayo Clinic," "MayoClinic.org," "Mayo Clinic Healthy Living," and the triple-shield Mayo Clinic logo are trademarks of Mayo Foundation for Medical Education and Research. Advertising revenue supports our not-for-profit mission.Check out these best-sellers and special offers on books and newsletters from Mayo Clinic. When a combination of these symptoms last for an extended period of time, this is generally referred to as post-concussion syndrome.Traumatic brain injuries at the base of the skull can cause nerve damage to the nerves that emerge directly from the brain (cranial nerves).

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