ting ▁heavy ▁weights , ▁during ▁force ful ▁def ec ation ▁or ▁part ur ition ▁( child b irth ). ▁ ▁C lin ical ▁significance ▁ ▁An ▁ab dom inal ▁mus cle ▁stra in , ▁also ▁called ▁a ▁pulled ▁ab dom inal ▁mus cle , ▁is ▁an ▁injury ▁to ▁one ▁of ▁the ▁mus cles ▁of ▁the ▁ab dom inal ▁wall . ▁A ▁mus cle ▁stra in ▁occurs ▁when ▁the ▁mus cle ▁is ▁stretch ed ▁too ▁far . ▁When ▁this ▁occurs ▁the ▁mus cle ▁fib ers ▁are ▁torn . ▁Most ▁commonly , ▁a ▁stra in ▁causes ▁micro scop ic ▁tears ▁within ▁the ▁mus cle , ▁but ▁occasionally , ▁in ▁severe ▁inj uries , ▁the ▁mus cle ▁can ▁ru pt ure ▁from ▁its ▁attachment . ▁ ▁A ▁rect us ▁she ath ▁h emat oma ▁is ▁an ▁accum ulation ▁of ▁blood ▁in ▁the ▁she ath ▁of ▁the ▁rect us ▁ab domin is ▁mus cle . ▁It ▁causes ▁ab dom inal ▁pain ▁with ▁or ▁without ▁a ▁mass . ▁The ▁h emat oma ▁may ▁be ▁caused ▁by ▁either ▁ru pt ure ▁of ▁the ▁ep ig astr ic ▁ar tery ▁or ▁by ▁a ▁mus cular ▁te ar . ▁C aus es ▁of ▁this ▁include ▁ant ico ag ulation , ▁c ough ing , ▁pre gn ancy , ▁ab dom inal ▁surg ery ▁and ▁tra uma . ▁With ▁an ▁age ing ▁population ▁and ▁the ▁w ides p read ▁use ▁of ▁ant ico ag ul ant ▁medic ations , ▁there ▁is ▁evidence ▁that ▁this ▁histor ically ▁ben ign ▁condition ▁is ▁becoming ▁more