A person’s symptoms depend on several factors, such as whether the TBI was an open or closed head injury, the severity of the TBI, and the injury’s location in the brain. Common symptoms of TBIs include Loss of consciousness; Memory loss; Reduced levels of concentration/attention span; Dizziness and trouble balancing; Emotional disturbances, such as irritability, uncharacteristic behavior, and depression; Seizures; Confusion/disorientation; Headaches; Blurred vision; and Impaired speech, such as slurred speech or poor word recall.