The best replacement for spasm is cramp.

The best alternatives to spasm are rated as following:
★★★★★  cramp
★★★★  twitch
★★★  seizure
★★  pinched nerve
★★  heart attack
★★  strain
★★  spasticity
★  angina
★  tremor
★  palpitation
  muscle cramp
  fasciculation
  charlie horse
  pulled muscle
  tic
  baby moving
  hypertonicity
  heart palpitation
  sprain
  injury
  muscle twitch
  convulsion
  clonus
  kidney stone
  spastic
  rigor mortis
  contracture
  herniated disc
  blockage of fallopian tubes
  blockage
  blepharospasm
  muscle cramps
  herniated disk

Your alternative for spasm is not listed? Suggest!
Speaking about spasm, one probably shouldn't forget about broken ribs.

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



Google Trends

Scale is based on the average worldwide traffic of spasm in all years. Click on graph for more.
spasm
cramp
twitch