The extent of recovery from traumatic brain injury (TBI) depends on the severity of the injury, the location of the damage, and the effectiveness and intensity of medical treatment and rehabilitation. In some cases, people with mild TBIs can fully recover within weeks to months, while those with severe TBIs may experience long-term or permanent disability. For people with mild TBIs, rest, pain management, and gradual return to normal activities may be sufficient for a full recovery. However, people with moderate to severe TBIs typically require more intensive medical treatment and rehabilitation, which can include physical therapy, occupational therapy, speech therapy, and cognitive rehabilitation. Even with the most effective treatment and rehabilitation, some people may experience long-term or permanent cognitive, physical, or behavioral problems as a result of a TBI. These problems can include difficulty with memory and concentration, chronic pain, depression, anxiety, and behavioral changes.