What do systematic reviews say?

Ginger vs placebo

It is very uncertain whether ginger changes vomiting ‐ postoperative 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 0.2 [0.02, 1.65]
  1 study · 92 participants
  Very low