Does the statute of limitations begin to run in cases where there has been no perceptible trauma?

1 We have previously defined this doctrine as meaning that in cases where injury has been inflicted without perceptible trauma the statute of limitations does not begin to run until plaintiff has discovered, or in the exercise of reasonable diligence should have discovered, all of the facts which are essential to the cause of action. (DeRose v. Carswell (1987) 196 Cal.App.3d 1011, 1017, 242 Cal.Rptr. 368 and citations contained therein.)