Hello kaw and welcome to NeuroTalk

Even if this thread is a year old this topic seems to pop up every summer.

It only takes a few minutes for some of us the be affected by the heat. In most cases the effect of the heat is considered a Pseudo-exacerbation, which means it's self limiting...once you cool down the symptoms go back to what is normal for you.

I have had the unfortunate experience of heat triggering 4 of my 5 exacerbations (relapse, attack, flare-up), not a pseudo-exacerbation but the real deal. I hate summer.

There are those of us who are heat and cold sensitive...I am both

Heat and MS:
http://www.nationalmssociety.org/abo...ity/index.aspx