If your hand is electrocuted by touching metal, this could be physiological. Physiological factors mainly include dry skin, wearing clothing containing a lot of chemical fibers or wool. The human body itself has a certain amount of bio-static electricity, which is generated when the skin comes into contact with the air. If the hand touches the metal with a sense of electric shock, this is a very common physiological phenomenon, after repeated contact discharge, or usually can use hand cream to relieve. Wearing chemical fiber or wool content of clothing and human body friction will produce static electricity, especially when the air is dry, it is more likely to produce a lot of static electricity, and will even accumulate static electricity in the body. If you touch metal with your hands, you will have the symptom of electrocution. Normally, this does not require treatment. If there is frequent contact with metal, it is often recommended that you can use hand lotion or an air humidifier to increase the humidity of the air, and reduce or avoid wearing chemical fibers or clothing that contains more wool.