Eye witnesses said that the rapper suffered a seizure after falling to the ground while performing, but Tone Lōc's manager could not confirm the seizure claims to TMZ.
His manager suggested that exhaustion from holding 12 concerts over the last eight weeks was the most likely cause of the musician's hospitalisation.
The rapper was arrested in June following an alleged physical confrontation with the mother of his children.
He pled no contest to weapons and domestic violence charges stemming from the altercation and was sentenced to one day in jail.
Tone Lōc scored several rap hits in the early 1990s with the singles 'Wild Thing', 'Funky Cold Medina' and 'All Through The Night'.
Watch amateur footage of Tone Lōc performing 'Funky Cold Medina' just minutes before his stage collapse below: