The best replacement for blockage is constipation.

The best alternatives to blockage are rated as following:
★★★★★  constipation
★★★  blockade
★  impaction
★  spasm
★  obstruction
  damage

Your alternative for blockage is not listed? Suggest!
Speaking about blockage, one probably shouldn't forget about heart attack.

Other search terms related to blockage and their ratings are:
★★★★★ heart attack
You have in mind a companion for blockage and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of blockage in all years. Click on graph for more.
blockage
constipation
blockade