What do systematic reviews say?

Ginger vs placebo

It is very uncertain whether ginger changes vomiting ‐ intraoperative compared with placebo (very low certainty).

• Interventions for preventing nausea and vomiting in women undergoing regional anaesthesia for caesarean section 2021 · Cochrane Headline outcomes only
  RR 0.62 [0.38, 1]
  2 studies · 331 participants
  Very low