Fresh raw vegetable juice actually aids digestion, rather than causing indigestion. However, if you are used to drinking pasteurized juice, raw vegetable juice may cause discomfort that feels like indigestion at first.
Juicing vegetables and drinking the juice in large quantities may cause a shock to your body if you haven't had raw juice before. Symptoms of this may include a burning in the upper abdomen or chest, which is similar to indigestion.
Raw Juice Safety
Store-bought juices are pasteurized to kill bacteria, according to the FDA. It also increases shelf life. Because raw juice will spoil faster, do not leave it in the refrigerator for more than three days. Drinking spoiled raw vegetable juice could lead to digestive discomfort.
According to the University of Virginia, indigestion causes include lactose, anxiety, or alcohol. There is no evidence that vegetable juice causes indigestion.
Northwestern Health Sciences University suggests drinking raw vegetable juices to aid digestion.
When you start juicing vegetables, mix them with equal parts water at first to lesson the shock to your stomach, and then gradually increasing the amount of juice every day until the feeling of indigestion subsides.