Laughter is a powerful antidote to pain. Time and time again it has been shown that the old adage Laughter is The Best Medicine really has a grounding in the truth.Laughter is a tranquilizer with no side effects. ~ Arnold H. Glasgow
One possible explanation could be that This means it has an effect on pain both a mentally and physically.
"...humor helps to reflect pain, thus helping both the patients as well as their carers to deal better with stress," said Professor Willibald Ruch, Zurich University. "Humor can be used specifically as a cognitive technique, for example in terms of a distraction to control the pain and increase pain tolerance."The idea that laughter reduces pain is not new. Dr. James Walsh, an American physician, noted in his 1928 book, Laughter and Health, that laughter appeared to reduce the level of pain experienced following surgery.
"It's exactly what happens when we say 'I laughed until it hurt'. It seems to be extremely painful and it's that pain that produces the endorphin effect." Professor Robin Dunbar.