Friend2U,

This will give you a little bit of information about heat and MS -
http://www.nationalmssociety.org/sit...ourcebook_heat

Heat doesn't affect everyone negatively but heat intolerance is common.

Heat has been known to cause a pseudoexacerbation (temporary worsening of MS symptoms which go away once the trigger (heat, fever, infection goes away).

However, heat has triggered exacerbations for me, not the pseudo kind but the real deal. I have a very healthy respect for heat and especially summertime.