ys i ology ▁Overflow ▁in cont in ence ▁occurs ▁when ▁the ▁patient ' s ▁bl ad der ▁is ▁always ▁full ▁so ▁that ▁it ▁frequently ▁le aks ▁ur ine . ▁We ak ▁bl ad der ▁mus cles , ▁resulting ▁in ▁incomplete ▁empty ing ▁of ▁the ▁bl ad der , ▁or ▁a ▁blocked ▁u re th ra ▁can ▁cause ▁this ▁type ▁of ▁in cont in ence . ▁Aut onom ic ▁ne urop ath y ▁from ▁di ab etes ▁or ▁other ▁dise ases ▁( e . g . ▁Multiple ▁s cl eros is ) ▁can ▁decrease ▁neural ▁signals ▁from ▁the ▁bl ad der ▁( allow ing ▁for ▁over fill ing ) ▁and ▁may ▁also ▁decrease ▁the ▁exp ulsion ▁of ▁ur ine ▁by ▁the ▁det rus or ▁mus cle ▁( allow ing ▁for ▁ur inary ▁ret ention ). ▁ ▁Additionally , ▁tum ors ▁and ▁kid ney ▁stones ▁can ▁block ▁the ▁u re th ra . ▁Sp inal ▁cord ▁inj uries ▁or ▁nerv ous ▁system ▁dis orders ▁are ▁additional ▁causes ▁of ▁overflow ▁in cont in ence . ▁In ▁men , ▁ben ign ▁pro static ▁hyper pl asia ▁( B PH ) ▁may ▁also ▁restrict ▁the ▁flow ▁of ▁ur ine . ▁ ▁Overflow ▁in cont in ence ▁is ▁rare ▁in ▁women , ▁although ▁sometimes ▁it ▁is ▁caused ▁by ▁fib roid ▁or ▁o var ian ▁tum ors . ▁Also ▁overflow ▁in cont in ence ▁can ▁be ▁from ▁increased ▁out let ▁resistance ▁from ▁advanced ▁v ag inal ▁pro lapse ▁causing ▁a ▁" k ink " ▁in ▁the ▁u re th ra