Ginger has long been used in folk medicine to treat everything from colds to constipation. Ginger can be used fresh, in powdered form (ginger spice), or candied. Although the flavor between fresh and ground ginger is significantly different, they can be substituted for one another in many recipes. In general, you can replace 1/8 teaspoon of ground ginger with 1 tablespoon of fresh grated ginger, and vice versa.
Consuming ginger and ginger products, in addition to taking any anti-nausea medications as prescribed, may provide some comfort for a queasy stomach during cancer treatment.