The best replacement for left side is right side of brain.

The best alternatives to left side are rated as following:
★★★★★  right side of brain
★★★★  right side of the brain
★★★  right side brain
★★  right side
★★  right sided heart failure
★  right side heart failure
★  right sided colon cancer
★  right side of heart
  right side of bed
  left hand side
  right sided stroke

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Speaking about left side, one probably shouldn't forget about gallstones.

Other search terms related to left side and their ratings are:
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left side
right side of brain
right side of the brain