The former San Diego Chargers star was admitted to Scripps La Jolla Hospital in San Diego after he drove his SUV (Sports Utility Vehicle) off the edge of the road and over a cliff in Carlsbad.
A hospital spokesperson tells TMZ.com Seau was treated for cuts and bruises and checked out on Tuesday morning (19Octo10).
Police are now investigating the crash, which reportedly occurred hours after Seau was arrested on suspicion of domestic violence.
He was taken into custody by California police at around 2am on Monday (18Oct10) and booked into the Vista Detention Facility following an altercation with an unidentified female. He was released shortly afterwards.
Officials tells the website Seau did not appear to be under the influence of drugs or alcohol but he was given a blood test after the accident.
Results from the blood test are expected within six weeks.