Before modern medicine and anesthetics, alcohol was used as a pain reliever and anesthetic. It wasn’t long ago that patients were carried into an operating room completely inebriated. Since the invention of modern anesthetics, alcohol has left the operating room, but is still accidentally used as a pain reliever during a drunken night.
Many have found that when an injury occurs while drunk, the severity of the injury is not initially recognized. It isn’t until the individual has sobered up the next day that they feel the pain from the previous night’s injury. Alcohol has an effect on your central nervous system which explains why it can act as a temporary anesthetic.