vis , ▁the ▁weak ness ▁affect s ▁the ▁legs ▁more ▁than ▁the ▁arms . ▁This ▁leads ▁to ▁difficulties ▁clim bing ▁st airs ▁and ▁rising ▁from ▁a ▁sitting ▁position . ▁We ak ness ▁is ▁often ▁rel ieved ▁tempor arily ▁after ▁ex ert ion ▁or ▁physical ▁exercise . ▁High ▁temper atures ▁can ▁w ors en ▁the ▁sympt oms . ▁We ak ness ▁of ▁the ▁bul bar ▁mus cles ▁( mus cles ▁of ▁the ▁mouth ▁and ▁thro at ) ▁is ▁occasionally ▁encountered . ▁We ak ness ▁of ▁the ▁eye ▁mus cles ▁is ▁un common . ▁Some ▁may ▁have ▁double ▁vision , ▁dro op ing ▁of ▁the ▁e y el ids ▁and ▁difficulty ▁sw allow ing , ▁but ▁generally ▁only ▁together ▁with ▁leg ▁weak ness ; ▁this ▁too ▁distingu ishes ▁LE MS ▁from ▁my as then ia ▁gra vis , ▁in ▁which ▁eye ▁signs ▁are ▁much ▁more ▁common . ▁In ▁the ▁advanced ▁stages ▁of ▁the ▁disease , ▁weak ness ▁of ▁the ▁resp ir atory ▁mus cles ▁may ▁occur . ▁Some ▁may ▁also ▁experience ▁problems ▁with ▁coord ination ▁( ata x ia ). ▁ ▁Three - quarters ▁of ▁people ▁with ▁LE MS ▁also ▁have ▁dis ruption ▁of ▁the ▁autonom ic ▁nerv ous ▁system . ▁This ▁may ▁be ▁experienced ▁as ▁a ▁dry ▁mouth , ▁const ip ation , ▁bl ur red ▁vision , ▁imp a ired ▁swe ating , ▁and ▁orth ost atic ▁hyp ot ension ▁( falls ▁in ▁blood ▁pressure ▁on ▁standing , ▁potentially ▁leading ▁to ▁black outs ). ▁Some ▁report ▁a ▁met all ic ▁taste ▁in ▁the