The best replacement for muscle spasm is heart attack.

The best alternatives to muscle spasm are rated as following:
★★★★★  heart attack
★★★★  pinched nerve
★★★  twitch
★★★  cramp
★★  baby moving
★★  seizure
★★  kidney stone
★★  pulled muscle
★★  herniated disc
★  tremor
★  spasticity
★  irregular heartbeat
★  muscle cramp
★  slipped disc
★  fasciculation
★  muscle strain
  muscle twitch
  charlie horse
  nerve
  guarding
  trigger point
  muscle tightness
  muscle cramps
  herniated disk

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Speaking about muscle spasm, one probably shouldn't forget about pinched nerves.

Other search terms related to muscle spasm and their ratings are:
★★★★★ pinched nerves
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Google Trends

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muscle spasm
heart attack
pinched nerve