Diarrhea is a potential side effect of drinking kombucha, although it is not common. Kombucha may contain higher levels of caffeine than other beverages, which can also cause diarrhea if consumed in excess. If you experience diarrhea after drinking kombucha, it is recommended to stop drinking it until your symptoms subside. If your symptoms persist, you should consult a healthcare provider. To minimize the risk of digestive upset, it is recommended to start with a small amount of kombucha and gradually increase your intake as tolerated. It is also important to properly prepare and store homemade kombucha to reduce the risk of contamination by harmful bacteria or other pathogens.