Does Elon Musk have PTSD? Biographer Walter Isaacson says the billionaire’s turbulent childhood with an abusive father left him scarred

Elon Musk has post-traumatic stress disorder from a turbulent childhood that included time in apartheid South Africa and verbal abuse from his father, famed author Walter Isaacson claims in his new biography of the Tesla CEO.

But does the co-founder of six companies actually have the psychiatric condition, thought to affect around 5% of the global population? Was Isaacson misappropriating the term, as mental health experts say commonly occurs? Or is Elon’s mental state, perhaps, even more nuanced than Isaacson alludes to?

“As a kid growing up in South Africa, Elon Musk knew pain and learned how to survive it,” Isaacson pens in his new book, “Elon Musk,” released Tuesday by publisher Simon & Schuster.

Isaacson—who has authored other best-selling biographies, such as those of Steve Jobs, Jeff Bezos, and Leonardo Da Vinci—writes of young Elon’s time at a South African “wilderness survival camp known as veldskool.” The business savant refers to it as a “paramilitary Lord of the Flies.”

There, “bullying was considered a virtue,” Isaacson writes. “The kids were each given small rations of food and water, and they were allowed—indeed encouraged—to fight over them.” Small and awkward at the time, Elon was “beaten up twice” and lost 10 pounds during his first stint there.

At one point, attendees were “divided into two groups and told to attack each other,” Isaacon writes. “‘It was so insane, mind-blowing,’ Musk recalls. Every few years, one of the kids would die. The counselors would recount such stories as warnings. ‘Don’t be stupid like that dumb f**k who died last year,’ they would say.”

Trauma is common. PTSD isn’t

Such experiences could potentially lead to a diagnosis of PTSD, according to Dr. Craig Chepke, medical director of Excel Psychiatric Associates in Huntersville, N.C., and an assistant professor of psychiatry at State University of New York, who speaks on the topic.

Criteria for diagnosing the condition, according to the Diagnostic and Statistical Manual of Mental Disorders, include “exposure to actual or threatened death, serious injury, or sexual violence.” Because of this, when people think of PTSD, their thoughts often turn to combat veterans or survivors of violent crimes like assault.

“But it really is so much more complicated than that,” Chepke says of the disorder, which could result from intimate partner abuse or even a “significant car accident—anything where there’s any sort of substantial trauma with threat to life or limb, or where there is substantial fear faced.”

Everyone gets scared from time to time. But in the case of fear experienced by those who go on to develop PTSD, “it’s a really dramatically elevated amount,” he tells Fortune. While the fear is appropriate, given the extreme nature of the situation, “the brain kind of learns to remain afraid, so the fight-or-flight response remains persistent long after the threat has been removed.”