Question: why does my stomach hurt after drinking boba?
Answer: Boba = Tapioca Pearls = Cassava Root If you thought its lack of nutrients was bad, get this: cassava can be toxic when eaten raw. The tapioca starch has to be detoxified before consumption due to its levels of cyanide, a toxic compound that when ingested can cause headaches, nausea, vomiting, and even paralysis.