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Exploring the Connection Between Emotional Wellbeing and Physical Health

Scientific research has demonstrated that prolonged stress can influence immune function, inflammation, hormonal responses, patterns of gene expression, wound-healing processes, and aspects of the biological cellular milieu.[1][2][3][4][5]

Scientific studies have also identified significant associations between adverse childhood experiences and various health conditions later in life, including heart disease, cancer, and chronic lung disease.[6]

Yet important questions remain unanswered, particularly regarding the potential role of unresolved emotional experiences, long-standing psychological patterns, and personal history in physical health and disease.

Please read the full study for the most accurate understanding of its findings and context. The summaries provided here are intended as brief educational overviews.

[1]

Psychological Stress and the Human Immune System

Segerstrom & Miller · 2004 · Psychological Bulletin — Meta-analysis of 319 published scientific papers involving a total of 18,941 participants

What researchers explored:

Researchers analyzed more than 300 published scientific papers examining how different forms of psychological stress, particularly chronic stress, are associated with changes in immune function.

Key finding:

Chronic psychological stressors were associated with reduced immune function across several measures, including T-cell responsiveness and natural killer-cell activity.

These immune processes have been found by researchers to play important roles in protecting the body against infections and recognizing abnormal cells, including certain cancer cells.

The findings highlight how prolonged stressful life circumstances may influence important biological defenses.

What Remains to Be Understood

While these immune processes are important in cancer biology and many other chronic health conditions, the extent to which chronic psychological stress may influence the development or progression of these conditions through these mechanisms remains incompletely understood.

Read original study ↗

[2]

Chronic Stress and Inflammation

Kiecolt-Glaser et al. (2003)
Proceedings of the National Academy of Sciences (PNAS) — Six-year human study involving 225 participants

What researchers explored:

Researchers followed 225 older adults over six years, comparing individuals experiencing prolonged emotional and psychological stress from caring for a spouse with dementia against individuals who were not caregivers.

They measured changes in interleukin-6 (IL-6), an important inflammatory signaling protein associated with numerous chronic health conditions.

Key finding:

The average rate of increase in IL-6 was approximately four times greater among caregivers than non-caregivers, demonstrating a significant association between prolonged psychological stress and increased inflammatory activity.

Interestingly, the elevated rate of increase persisted among former caregivers, even several years after their caregiving responsibilities had ended.

The findings suggest that chronic psychological stress may contribute to sustained changes in inflammatory activity, a biological process relevant to cardiovascular disease, arthritis, diabetes, and certain cancers.

Read original study ↗

[3]

Chronic Feelings of Social Isolation and Gene Expression

Cole et al. (2015) · Proceedings of the National Academy of Sciences (PNAS) — Longitudinal human study involving 141 participants

What researchers explored:

Researchers examined 412 blood immune-cell gene-expression profiles collected from 141 adults over several years, investigating how prolonged subjective feelings of loneliness and social isolation were associated with changes in gene activity.

Key finding:

Individuals reporting chronic feelings of loneliness and social isolation showed increased activity in genes involved in inflammation, alongside reduced activity in certain genes associated with antiviral responses and antibody production.

These changes were observed in immune cells and were associated with differences in how the body regulates inflammatory and immune processes.

The findings suggest that prolonged experiences of loneliness and perceived social disconnection may influence biological activity at the level of gene expression, without altering the underlying DNA sequence.

What Remains to Be Understood

Although the findings demonstrate associations between perceived social isolation and changes in gene expression, including changes in biological pathways relevant to cancer and other diseases, the study did not establish whether these changes influenced cancer initiation, progression, recurrence, or survival.

Read original study ↗

[4]

Psychological Stress Management and Gene Expression

Antoni et al. (2012)
Biological Psychiatry — Randomized human study involving 199 women with breast cancer, including 79 participants in the gene-expression analysis

What researchers explored:

Researchers investigated whether a 10-week psychological stress-management program could influence gene expression in women undergoing treatment for breast cancer.

Participants were assigned to either a structured cognitive-behavioral stress-management program or a comparison group. Researchers measured gene-expression activity in blood immune cells at the beginning of the study and during follow-ups at six and twelve months.

The program included emotional coping skills, identifying and changing stressful thought patterns, relationship and communication skills, and relaxation practices.

Key finding:

Women participating in the stress-management program showed changes in the expression of 91 genes compared with the control group, including reduced activity in genes involved in inflammatory signaling and certain biological processes associated with cancer metastasis.

Researchers also observed increased activity in genes involved in antiviral immune responses.

These findings demonstrate that a structured psychological intervention can influence measurable gene-expression patterns in immune cells, including pathways involved in inflammation.

What Remains to Be Understood

Although the findings demonstrate changes in gene expression, including changes in biological pathways relevant to cancer and other diseases, the study did not establish whether these changes influenced cancer progression, recurrence, or survival.

Read original study ↗

[5]

Relationship Conflict, Inflammation, and Wound Healing

Kiecolt-Glaser et al. (2005)
Archives of General Psychiatry — Human study involving 42 married couples (84 participants)

What researchers explored:

Researchers investigated how supportive interactions versus marital conflict influenced inflammatory activity and wound healing in 42 married couples.

During two separate hospital visits, researchers created small, standardized skin wounds and measured healing rates, inflammatory cytokines, and the couples’ interactions, including expressions of hostility.

Key finding:

Wounds healed more slowly following marital conflict than after supportive interactions. Couples who consistently displayed higher levels of hostility healed at approximately 60% of the rate observed in less-hostile couples.

Researchers also found that more hostile couples experienced greater increases in circulating inflammatory cytokines, including IL-6 and TNF-α, following conflict. At the wound sites themselves, however, production of inflammatory cytokines was lower following conflict, potentially contributing to slower healing.

These findings demonstrate how stressful relationship interactions can be associated with measurable changes in inflammatory activity and the body’s wound-healing processes.

Read original study ↗

[6]

Childhood Experiences and Long-Term Health

Felitti et al. (1998)
American Journal of Preventive Medicine — Human observational study involving 9,508 adults

What researchers explored:

Researchers examined the relationship between adverse childhood experiences, including emotional, physical, and sexual abuse and household dysfunction, and a range of health-related behaviors and medical conditions in adulthood.

Key finding:

Individuals reporting greater exposure to adverse childhood experiences showed higher rates of several chronic health conditions, including heart disease, cancer, and chronic lung disease.

Those reporting four or more categories of childhood adversity had approximately 1.9 times the adjusted odds of reporting cancer, 2.2 times the adjusted odds of ischemic heart disease, and 3.9 times the adjusted odds of chronic bronchitis or emphysema, compared with individuals reporting no such experiences.

The findings highlight significant associations between adverse childhood experiences and physical health later in life.

Read original study ↗

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