The 46 year old veered into oncoming traffic and collided with another vehicle in San Diego County on Tuesday (02Aug11), according to the Associated Press.
O'Neal was taken to Palomar Medical Center after complaining of pain, and discharged later that day. The condition of the other driver involved in the accident is not yet known.
It's a double blow for the O'Neal family - Griffin's half-brother Redmond was arrested on suspicion of drug possession and violating probation after a police officer allegedly found heroin in his car earlier on Tuesday.
Griffin's sister, actress Tatum, took to her Twitter.com page to address the news, writing, ""My Oneal (sic) brothers are not doing that great right now. Will take a prayer if you have it in you.""