Many ways: Blockage due to infection is near the top of the list; but many women without infection history still get blockages. Prior surgery with adhesion formation is another cause. Proximal blockages (near where the tube leaves the uterus) are roughly 50% due to 'clogging' with mucus, clot, etc, ...Like a clogged drain in a sink.
Answered 3/15/2016
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