(Exploring Psychology: eighth edition in modules, David G Myers)
"Some investigators have reported that people are at increased risk for cancer within a year after experiencing depression, helplessness, or bereavement. One large Swedish study revealed that people with a history of workplace stress had 5.5 times greater risk of colon cancer than those who reported no such problems, a difference not attributable to differing age, smoking, drinking, or other physical characteristics (Courtney et al., 1993)
Other researchers,however have found no link between stress and human cancer (Edelman & Kidman, 1997; Fox, 1998; Petticrew et al., 1999, 2002). Concentration camp survivors and former prisoners of war for example, have not exhibited elevated cancer rates.
One danger in hyping reports on stress management and cancer is that some patients may then blame themselves for their illness - "If only I had been more expressive, relaxed, and hopeful." A corollary danger is a "wellness macho" among the healthy, who take credit for their "healthy character" and lay a guilt trip on the ill: "She has cancer? That's what you get for holding your feelings in and being so nice." Dying thus becomes the ultimate failure.
The emerging view seems to be that stress does not create cancer cells. At worst, it may affect their growth by weakening the body's natural defenses against proliferating malignant cells (Antoni &Lutgendork, 2007). Although a relaxed, hopeful state may enhance these defenses, we should be aware of the thin line that divides science from wishful thinking. The powerful biological processes at work in advanced cancer or AIDS are not likely to be completely derailed by avoiding stress or maintaining a relaxed but determined spirit (Anderson, 2002; Kessler et al., 1991). Often, however patients or their friends and families look to certain sources for help in preventing or defeating illnesses.
We can view the stress effect on our disease resistance as a price we pay for the benefits of stress. Stress invigorates our lives by arousing and motivating us. An unstressed life would be hardly challenging or productive. Moreover, it pays to spend our resources in fighting or fleeing an external threat. But we do so at the cost of diminished resources for fighting internal threats to health.When the stress is momentary the cost in negligible.When uncontrollable aggravations persist, the cost may become considerable."
Just more of a reason to be B'simcha Tamid!