This includes hot tubs, saunas, lying out in the hot sun, exercising excessively without adequate cooling measures, etc. Even though the symptoms brought on
by heat are usually reversible, they can rarely be permanent or set off a lingering relapse. Just ask our Julie, Sarahsmom.
So, symptoms that reappear after "accidentally" getting overheated should be reported to your doctor, but it is not proof that this is MS. It is just a piece of the puzzle.