Rhubarb (Rheum officinale) is a plant. Its stalk is commonly eaten. Its root and underground stem are used in traditional Chinese medicine combinations.

Rhubarb contains chemicals that might help heal cold sores and reduce swelling. Rhubarb also contains fiber, which might help reduce cholesterol levels and affect stomach conditions.

People use rhubarb for diarrhea, stomach pain, indigestion, symptoms of menopause, menstrual cramps, obesity, swelling of the pancreas, and many other conditions.