ESPN.com Interviews Dr. Williams About Dallas Cowboys Randy Gregory's Battle with Depression and Drugs

Dr. Vernon Williams, director of the Center for Sports Neurology & Pain Management at Cedars-Sinai Kerlan-Jobe Institute in Los Angeles, says that young adulthood is often a time when depression and anxiety emerge. Williams says that young professional athletes also face many mental health stressors such as new financial responsibility, travel, disordered sleep and intense scrutiny on social media.

"They often have pain because of injuries, so there's kind of this perfect storm in that period of life where they may be subject to emotional and psychological issues," Williams says, "and it's right at the same time when there's this increased availability of marijuana. Most people use it in the company of others, so it's kind of a personal storm."

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