A TBI may be classified as mild, moderate or severe depending on the severity of neurological disruption or damage to the brain. Mild TBI: A mild brain injury can have a serious impact on a person’s life. Even if the person retains most physical and cognitive abilities, he or she may suffer from mood disorders and personality changes. Additional symptoms may include headaches, confusion, lightheadedness, dizziness, vision problems, ringing in the ears, abnormal sleeping patterns and fatigue. Moderate TBI: A moderate brain injury can include nausea, fatigue, memory loss, dizziness, convulsions, seizures, persistent headaches, vision problems and loss of consciousness. A moderate TBI may also result in mood disorders or personality changes. Severe TBI: A severe brain injury can cause the symptoms of a moderate TBI, as well as impaired motor skill function and speech. In catastrophic cases, a severe TBI may result in trouble breathing, unconsciousness, a vegetative state, coma or wrongful death. TBI victims often require long-term medical care. Treatment may include rehabilitative therapy and care from speech pathologists, physical and occupational therapists and neurologists.