Not only does laughing make you feel great all over, it helps your body release serotonin and endorphins which help relieve pain and fight disease. Additionally, a proper laugh, straight from the gut can actually boost your immune system by decreasing stress hormones and increases immune cells and infection-fighting antibodies, improving your resistance to disease.
Research has also found that laughter relaxes the whole body. A good, hearty laugh relieves physical tension and stress, leaving your muscles relaxed for up to 45 minutes after. Laughter also protects the heart by improving the function and flow of blood vessels, which can help protect you against a heart attack and other cardiovascular problems.
So go ahead! Have a laugh!