To date, there is no evidence that TMS causes any kind of long term damage to the brain. TMS does carry a very minor risk or seizure during treatment, specifically less than 0.1%. This risk seems to be more associated with those who are already at risk of seizure, whether due to a medication, a chronic condition such as epilepsy, or secondary to drug and alcohol use. However, this potential for the treatment to induce a seizure reaction has not been seen to be a long term issue, only specifically during the TMS treatment.