Traumatic brain injury (TBI) occurs when an external force damages the brain and can range in severity from a mild concussion to severe injury resulting in death. There are two main types - closed brain injuries which do not break the skull but cause bruising and tearing, and penetrating injuries which break the skull. TBI can cause cognitive, motor, sensory and other deficits with symptoms ranging from confusion to paralysis. Physiotherapy is an important part of treatment and rehabilitation, using techniques like exercises, manual therapy and education to improve mobility, balance, strength and overall functioning. The goals and specific techniques used depend on each individual patient's condition and needs.