Common cause of a pipe blockage.   The question is often asked by a customer immediately after the removal of a blockage. What caused the blockage? Depending the type of plumbing fixture affected, the cause of a blockage can vary. A blocked bath or a wash-hand basin is usually caused by soap or hair. The pipe configurations can also contribute towards repeated episodes of blockage. Objects that are too big or do not dissolve will cause problems. A buildup of debris tapped in a bend wi...