I am writing to draw your readers’ attention to an underdiagnosed effect of traumatic brain injury (TBI), which we believe was implicated in our 31-year-old son’s suicide last August.

When he was 7 years old he fell and fractured his skull. He was in a coma for 5 days and experienced paralysis on the right side of his face. He made a miraculous recovery and afterwards appeared to go through puberty normally. However, after his death we …