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There is a problem when the valve that controls what blood is good and what blood is used, no longer is strong enough to control this flow. Heart valves get damaged or simply wear out. I think you are asking what causes blood to flow in the wrong direction. My guess is that it would be a faulty heart valve.
When veins arenât getting emptied, we look downstream to discover what portion of the pump is failing. JVD is therefore caused by right heart failure. (Of course, the most common cause of right heart failure is left heart failure, so that doesnât mean itâs an isolated event.) If JVD isnât the heartâs fault, then we look to fluid levels. Too much circulating volume will lead to bulging veins for obvious reasons; the flexible tubes are simply extra full.