"The Earth is like a gigantic battery that contains a natural, subtle electric charge—a special kind of energy present in the ground. For safety and stability, most everything in the electrical world is connected to it, whether it is an electric power plant or your refrigerator. That’s what the term “grounded” means.
Being grounded also applies to people. When you are electrically grounded, you feel:
Overall, you feel good. If you have pain, you have less of it, or maybe none at all, when grounded."