Cumin seeds contain active ingredients that may help by:

Reducing indigestion and excess stomach acids
Decreasing gas
Reducing intestinal inflammation

A person with an upset stomach could try mixing 1 or 2 tsps of ground or powdered cumin into their meals. Alternatively, they could add a few teaspoons of cumin seeds or powder to boiling water to make a tea.

Some traditional medical systems suggest chewing a pinch or two of raw cumin seeds or powder to ease heartburn