Possible side effects associated with kombucha tea include nausea, vomiting, head and neck pain, allergic reactions, and abdominal discomfort, notes WebMD. The dangers of the tea come from the fact that it is often made at home, where it is difficult to regulate the process.
Some people are more susceptible to the dangerous side effects of kombucha tea. People with a lowered immune system, such as those with autoimmune disorders or a disease like HIV, should not drink the tea. It is also considered dangerous for women who are pregnant or breastfeeding, according to WebMD. Since it contains alcohol, it is not safe for children or people addicted to alcohol. People with diabetes must also be careful.