Nice of Bill Clinton to let us know Hillary’s fainted before — maybe many times.

The would-be first dude spilled the beans Monday in a sitdown with CBS’s Charlie Rose, who asked if her episode on Sunday was any indication of some more “serious” illness.

Bill’s reply: “Well, if it is, it’s a mystery to me and all of her doctors, because frequently — well, not frequently, rarely — but on more than one occasion over the last many, many years, the same sort of thing happened to her when she got severely dehydrated.” Oops.

Hillary then made a damage-control call in to Anderson Cooper of CNN, telling him the past episodes were “I think really only twice that I can recall.” I think, that I can recall.

Then another fudge: “You know, it is something that has occurred a few times over the course of my life.” Yup: a fast shift from “twice” to “a few times.”

Neither Clinton explained how dehydration or pneumonia produced Hillary’s striking stiffness in the now-viral video.

The larger question still stands: If the Clintons are (belatedly) admitting this much, how much worse is the full story?