Recording emotions can heal the body: writing about the emotional impact of illness can boost the resistance to disease. From the article:

[James Pennebaker] 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….

He found that the types of words people used changed over the course of the four sessions. Those whose wounds healed the fastest began by using the word “I” a lot, but in later sessions moved on to saying “he” or “she” more often, suggesting they were looking at the event from other perspectives. They also used words like “because”, implying they were making sense of the events and putting them into a narrative. So Pennebaker believes that the simple act of labelling your feelings and putting them into a story is somehow affecting the immune system.