It is thought that stress may affect your nervous, endocrine, and immune systems. Chronic stress may weaken your defenses, leaving you less resistant to disease.
An ongoing focus of research is whether these effects raise the risk of cancer. Specifically, does stress cause breast cancer or trigger it to spread? Does it raise the risk of recurrence and lower survival? And, importantly, does reducing stress make a difference?
This article will look at the evidence available to answer those questions. Read on to learn about how stress affects the mind and body and whether there is a connection to breast cancer.
You may know somebody with a similar story: After a period of chronic stress or significant loss, they found a lump and were diagnosed with cancer. But research has had conflicting results.
A study of 858 women in Poland looked at whether the cumulative effect of stress over time (death of a loved one, divorce, retirement, etc.) had a relationship with breast cancer rates. The study assessed potential stressors in the participants’ lives, as well as certain health factors like their family history and lifestyle habits.
Another study out of the United Kingdom was less conclusive. The Breakthrough Generations Study was a cohort study of over 106,000 women aged 16 or older, focused on breast cancer diagnosis as it related to stressful life events such as divorce or the death of a loved one. It also looked at similar lifestyle factors as the Poland study.
In that study, the researchers found no consistent evidence that self-reported frequency of stress and adverse life events affected breast cancer risk.
It may seem natural to associate negative emotions with breast cancer, but researchers are not sure if, or why, your body may be more vulnerable to cancer due to stress.
Although optimism and a fighting spirit are important, it’s just as important to have a support group or counselor to help you work through your emotions, both positive and negative.
Researchers have looked at this question from several angles, albeit mostly in cells in a dish or in rodents thus far.
From a biological standpoint, it would make sense that stress could stimulate breast cancer to grow or spread. When we are stressed we release a hormone called norepinephrine, one of our “stress hormones.”
Norepinephrine in turn may stimulate both the formation of new blood vessels that help feed cancers (angiogenesis) and hasten the spread of cancer (metastasis). Other studies looking at something called “telomerase activity” also suggest that there could be a biological basis behind stress facilitating the recurrence or spread of cancer.
Does this translate to living creatures? For mice who were placed in a simulated stressful environment, their tumors were more likely to spread.
Studies in humans also seem to point the finger at stress, though it’s more difficult to separate out other factors. In a fairly large study, women with some types of breast cancer lived longer if they participated in mindfulness stress reduction activities.
As a final note, we know that stress can cause insomnia. We’ve also learned that insomnia can be dangerous for people who have had cancer. It has been associated with lower survival rates for women with some types of breast cancer.
If you’ve had breast cancer and are feeling worried after considering this, take heart. Yes, it does appear that stress is unhealthy for those who have had cancer. But we’ve also learned that there is also something called posttraumatic growth. Cancer really can change people for the better!
Stress and Survival
What about stress and survival? Data is limited, but one trial found that people who received a 10-week stress management intervention had significantly lower mortality rates than those who didn’t get the counseling. That suggests, but doesn’t prove, that reducing stress improves survival.
However, it may not be the stress itself, but how the stress plays out, that affects outcomes.
For example, if a person is having anxiety about a cancer scan, maybe some days they can’t leave the couch. They might miss appointments as a result of their stress and anxiety, which might affect their survival.
If at any point in your cancer journey you feel so stressed that you are missing appointments, call a social worker or therapist to help you assess your stress and make a plan to learn coping mechanisms.
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Summary
A cancer diagnosis can be stressful, but does it have a direct correlation to a recurrence? The science leans that way but it is not conclusive. Certain effects of stress like abusing alcohol or missing medical appointments could contribute to cancer and worse treatment outcomes. Knowing your stress triggers and learning coping mechanisms can improve your quality of life.
