Meridian massager belongs to electrical appliances, which produces bioelectric effect through bioelectric movement. The harm is only as follows: 1. If the quality of the massage instrument is unqualified, it will leak after long-term use, which will lead to ion disorder in the body and produce side effects such as skin rupture, redness and heat pain; 2. If the application method is improper, it may lead to meridian disorder, yin-yang imbalance and aggravate the condition; 3. If the constitution is too sensitive, excessive nerve excitement after application will cause side effects such as palpitation, dizziness and insomnia.