) ▁and ▁other ▁ne uro log ical , ▁dem y elin ating ▁conditions ▁when ▁the ▁body ▁gets ▁over he ated ▁from ▁hot ▁weather , ▁exercise , ▁fe ver , ▁or ▁sa unas ▁and ▁hot ▁tub s . ▁It ▁is ▁possibly ▁due ▁to ▁the ▁effect ▁of ▁increased ▁temperature ▁on ▁n erve ▁condu ction . ▁With ▁an ▁increased ▁body ▁temperature , ▁n erve ▁imp uls es ▁are ▁either ▁blocked ▁or ▁slow ed ▁down ▁in ▁a ▁dam aged ▁n erve ▁but ▁once ▁the ▁body ▁temperature ▁is ▁normal ized , ▁signs ▁and ▁sympt oms ▁may ▁improve ▁or ▁disappear . ▁ ▁C lin ical ▁significance ▁ ▁Many ▁patients ▁with ▁MS ▁experience ▁increased ▁fat igue ▁and ▁other ▁sympt oms ▁such ▁as ▁pain , ▁concentration ▁difficulties , ▁and ▁ur inary ▁ur gency ▁when ▁exposed ▁to ▁heat . ▁As ▁a ▁result , ▁many ▁patients ▁with ▁MS ▁tend ▁to ▁avoid ▁sa unas , ▁warm ▁bath s , ▁and ▁other ▁sources ▁of ▁heat ▁or ▁wear ▁ice ▁or ▁ev apor ative ▁cool ing ▁app arel ▁in ▁the ▁form ▁of ▁v ests , ▁neck ▁wra ps , ▁arm / w rist ▁bands , ▁and ▁h ats . ▁▁ ▁Per i pher al ▁n erve ▁studies ▁have ▁shown ▁that ▁even ▁a ▁ 0 . 5   ° C ▁increase ▁in ▁body ▁temperature ▁can ▁slow ▁or ▁block ▁the ▁condu ction ▁of ▁n erve ▁imp uls es ▁in ▁dem y elin ated ▁n erves . ▁With ▁greater ▁levels ▁of ▁dem y el ination , ▁a ▁smaller ▁increase ▁in ▁temperature ▁is ▁needed ▁to ▁slow ▁down ▁the ▁n erve ▁imp