 In humans , a bite causes rapid and conspicuous swelling , intense pain , severe shock and local blistering . Other symptoms may include uncoordinated movements , defecation , urination , swelling of the tongue and eyelids , convulsions and unconsciousness . Blistering , bruising and necrosis may be extensive . There may be sudden hypotension , heart damage and dyspnoea . The blood may become incoagulable with internal bleeding that may lead to haematuria and haematemesis . Local tissue damage may require surgical excision and possibly amputation . Healing may be slow and fatalities during the recovery period are not uncommon . 
 In humans , a bite <a href='uninflect' title='1'><mark>causes</mark></a> rapid and conspicuous swelling , intense pain , severe shock and local blistering . Other symptoms may include uncoordinated movements , defecation , urination , swelling of the tongue and eyelids , convulsions and unconsciousness . Blistering , bruising and necrosis may be extensive . <a href='dey_it' title='2'><mark>There</mark></a> may be sudden hypotension , heart damage and dyspnoea . The blood may become incoagulable with internal bleeding <a href='null_relcl' title='3'><mark>that</mark></a>may lead to haematuria and haematemesis . Local tissue damage may require surgical excision and possibly amputation . Healing may be slow and fatalities during the recovery period <a href='negative_concord' title='4'><mark>are</mark></a> <a href='negative_concord' title='5'><mark>not</mark></a>uncommon . 
In humans , a bite cause rapid and conspicuous swelling , intense pain , severe shock and local blistering . Other symptoms may include uncoordinated movements , defecation , urination , swelling of da tongue and eyelids , convulsions and unconsciousness . Blistering , bruising and necrosis may be extensive . It may be sudden hypotension , heart damage and dyspnoea . Tdablood may become incoagulable with internal bleeding may lead to haematuria and haematemesis . Local tissue damage may require surgical excision and possibly amputation . Healing may be slow and fatalities during thdaecovery period ain't uncommon .