The Short Version
Ginger's anti-nausea effect in humans is supported by a substantial body of evidence, though its strength varies by context. Multiple meta-analyses report statistically significant nausea reduction in pregnancy and postoperative settings, and ACOG endorses ginger as a first-line nonpharmacologic option for pregnancy nausea. However, evidence for chemotherapy-induced nausea in adults is weak or negative, and authoritative reviews (NCCIH, Cochrane) flag generally low-to-moderate evidence quality. The claim is directionally accurate but overstates the uniformity and certainty of the evidence.