Depending on the severity of a traumatic brain injury, a person may experience temporary changes in brain function, permanent damage resulting in cognitive or physical impairments, or death. A mild traumatic brain injury may affect brain cells during and immediately after the event, resolving thereafter. Moderate traumatic brain injury can cause bleeding, bruising, tissue damage, and other physical harm to the brain that leads to long-term complications. For example, brain damage and cell death affecting a specific lobe of the brain may cause permanent changes or even inability to perform certain processes related to thinking, feeling, or physical function. The most severe traumatic brain injuries have the potential to cause death on impact or from complications resulting from TBI.