Many symptoms happen after TBI, including somatic symptoms such as nausea, dizziness, headaches, blurred vision, hearing changes, and fatigue. Other symptoms are cognitive complaints and emotional and behavioral problems. In mTBI, some symptoms have been seen separately between the psychological and biological mechanisms. Despite the predictors of symptoms found post-concussions being helpful, modern research has found psychological, motivational, and injury factors as significant levels of analysis that are connected with neurobiology. There are also symptoms between post-concussive and psychiatric disorders that are the same, like major depressive disorder, PTSD, and anxiety disorders. Having a psychotic disorder can also be a risk factor and an outcome of TBI. The occurrence of persistent post-concussive symptoms is found to be higher in the general population who have mTBI. This is due to having risk factors for slower brain injury recovery, greater mTBI severity, and the occurrence of peripheral injuries.