Then he waited for six months while monitoring how often the students visited the health centre. The day he saw the results, he left the lab, walked to his friend who was waiting for him in a car and told him he’d found something big. Remarkably, the students who had written about their secret feelings had made significantly fewer trips to the doctor in the subsequent months.Ever since, the field psychoneuroimmunology has been exploring the link between what’s now known as expressive writing, and the functioning of the immune system. The studies that followed examined the effect of expressive writing on everything from asthma and arthritis to breast cancer and migraines. In a small study conducted in Kansas, for example, it was found that women with breast cancer experienced fewer troublesome symptoms and went for fewer cancer-related appointments in the months after doing expressive writing.