hy la ctic ▁shock ▁related ▁to ▁exercise ▁ 5 – 2 4 ▁hours ▁following ▁the ▁consumption ▁of ▁shell fish . ▁ ▁The ▁condition ▁is ▁thought ▁to ▁be ▁more ▁pre val ent ▁in ▁women , ▁with ▁two ▁studies ▁of ▁E IA ▁patients ▁reporting ▁a ▁ratio ▁of ▁ 2 : 1 ▁for ▁females : m ales ▁with ▁the ▁dis order . ▁There ▁is , ▁however , ▁thought ▁to ▁be ▁no ▁link ▁to ▁race . ▁ ▁Survey ▁results ▁from ▁E IA ▁patients ▁have ▁shown ▁that ▁the ▁average ▁number ▁of ▁attacks ▁per ▁year ▁is ▁ 1 4 . 5 . ▁However , ▁most ▁suffer ers ▁of ▁E IA ▁report ▁that ▁both ▁sever ity ▁and ▁frequency ▁of ▁attacks ▁decrease ▁over ▁time . ▁ ▁Sym pt oms ▁ ▁The ▁an ap hy la xis ▁campaign ▁spl its ▁sympt oms ▁of ▁E IA ▁into ▁two ▁categories : ▁m ild ▁and ▁severe . ▁M ild ▁sympt oms ▁may ▁include ▁" w ides p read ▁fl ushing ▁of ▁the ▁skin ", ▁h ives ▁or ▁u rt ic aria , ▁sw elling ▁of ▁the ▁body ▁( ang io ed ema ), ▁sw elling ▁of ▁the ▁lips , ▁and ▁n ause a ▁or ▁vom iting . ▁More ▁severe ▁sympt oms ▁might ▁include ▁the ▁sw elling ▁of ▁the ▁tongue , ▁difficulty ▁in ▁sw allow ing ▁or ▁breath ing , ▁con str iction ▁of ▁the ▁air ways , ▁feeling ▁faint , ▁and ▁un cons cious ness . ▁ ▁Sym pt oms ▁can ▁start ▁immediately ▁following ▁exercise , ▁but ▁ 9 0 % ▁of ▁patients ▁report ▁experien