In its most basic form, betel nut is a seed of the Areca catechu, a type of palm tree. It’s commonly chewed after being ground up or sliced and wrapped in leaves of the Piper betle vine that have been coated with lime. This is known as a betel quid. Tobacco or flavorful spices may also be added.
Betel nut is used for schizophrenia, a group of eye disorders that can lead to vision loss (glaucoma), poor digestion, and many other conditions, but there is no good scientific evidence to support these uses. Using betel nut might also be unsafe.
Some people use betel nut as a recreational drug because it speeds up the central nervous system (CNS).
More evidence is needed to rate the effectiveness of betel nut for these uses.
Chewing betel nut can make your mouth, lips, and stool turn red. It can cause stimulant effects similar to caffeine and tobacco use. It can also cause more severe effects including vomiting, diarrhea, gum problems, increased saliva, kidney disease, liver disease, heart disease, chest pain, abnormal heart beat, low blood pressure, shortness of breath and rapid breathing, heart attack, coma, and death.