Brain injury is unpredictable in its consequences. Brain injury affects who we are and the way we think, act, and feel. It can change everything about us in a matter of seconds. An acquired brain injury (ABI) is an injury to the brain that is not hereditary, congenital, degenerative, or induced by birth trauma. Essentially, this type of brain injury is one that has occurred after birth. The injury results in a change to the brain’s neuronal activity, which affects the physical integrity, metabolic activity, or functional ability of nerve cells in the brain.