A study was conducted by researchers at Oxford University found that heartfelt laugh reduces the sensation of pain. Indeed, laughter stimulates the release of the endorphin hormones which evoke a feeling of well-being working as a natural painkiller.
The series of experiments tested the pain tolerance of people who had participated in activities that are aimed at arousing laughter like watching funny videos or shows. Others had taken part in activities that were not amusing. Those who had watched comedies and laughed were able to tolerate 10% more pain than others. The endorphins released when they laughed helped them withstand the physical and emotional pain.