It must be harmless in a short time. However, if it is a long-term electric shock, I advise you to consider it very carefully. The two extremes meet in the competition. Long-term electric shock, even if the current is very small, will be dangerous, especially if the current continues to flow through the human body for more than the heartbeat cycle, which is a great threat to the heart and is prone to ventricular fibrillation. Therefore, electroshock physiotherapy cannot be used as a long-term treatment.