Stuttering can develop later in life due to psychological or neurological trauma. It has been found that  people who have had any form of brain injury such as stroke or TBI (traumatic brain injury) can develop stuttering. It has also been found that when people go through an emotional trauma such as the death of a family member, and they are not able to cope, they can also develop a stutter. There have also been medications tested such as antidepressants that have been found to develop a stutter in adults.