Depression is often described as a disorder of brain chemistry, genetics, or stressful life events. Biology certainly matters, but a growing body of research shows that our social environment, including the quality of our relationships, financial stability, sense of belonging, and daily interactions, plays a substantial role in determining who develops Major Depressive Disorder (MDD) and who recovers from it.
A recent feature examining social determinants of depression cites some striking figures: the World Health Organization estimates that roughly 4% of the world’s population lives with Depression, including 5.7% of adults, and Gallup polling found that more than 18% of U.S. adults reported current or past treatment for Depression in 2024 and 2025, with 28.5% reporting a lifetime diagnosis. The feature makes clear that mental health cannot be understood solely through neurotransmitters and medication. Factors such as loneliness, income, marginalization, and food insecurity are consistently associated with a higher risk of Depression, while strong social support and meaningful connection remain among the most protective factors identified in the research.
At Mid City TMS, we believe effective Depression treatment should address both the biological and social contributors to illness. Advanced therapies we offer, such as transcranial magnetic stimulation (TMS) and esketamine (Spravato), can help restore healthy brain function, but lasting recovery is often strongest when treatment is paired with improved social support and attention to the broader circumstances affecting a person’s life.
Depression Is a Biopsychosocial Illness
Modern psychiatry recognizes Depression as a biopsychosocial condition, meaning three major categories of factors interact:
- Biological factors – genetics, brain circuitry, inflammation, and neurotransmitter function
- Psychological factors – personality traits, coping skills, trauma history, and thought patterns
- Social factors – relationships, economic conditions, community support, and exposure to discrimination
While much of the public conversation focuses on biology, social factors are often highly modifiable and can carry a surprisingly large influence on mood and resilience. A 2024 review in World Psychiatry describes social determinants of mental health as the conditions in which people are born, grow, live, work, and age, factors that shape access to opportunity, stress exposure, and the resources available to cope with adversity.
What Are Social Determinants of Mental Health?
Social determinants are non-medical factors that influence mental and physical health outcomes. Key domains include:
- Economic stability
- Employment
- Education
- Housing quality and security
- Access to healthcare
- Neighborhood safety
- Social support and connectedness
- Experiences of marginalization and discrimination
When these domains are unfavorable, the risk of Depression rises. Financial strain creates chronic stress and uncertainty. Unsafe neighborhoods can limit exercise and social engagement. Social isolation deprives people of emotional support. Discrimination can produce persistent feelings of exclusion and helplessness.
Social Isolation and Loneliness: Among the Most Powerful Social Risk Factors
Among all social determinants, loneliness and social disconnection show some of the strongest associations with Depression. People are fundamentally social beings, and emotional support helps buffer stress and provide a sense of meaning and belonging. When that support is absent, the brain and body may respond as though under chronic threat.
The COVID-19 pandemic drove a sharp rise in reported loneliness: 25% of Gallup respondents said they had felt lonely for much of the previous day at the 2021 peak. That figure declined somewhat in the years after, but by September 2025 it had climbed back to 21%, its highest point since 2021. Separately, the CDC has reported that roughly one in three U.S. adults feels lonely and about one in four lacks adequate social or emotional support. Loneliness and isolation are associated with increased risk not only of Depression and anxiety, but also self-harm, suicidality, dementia, and heart disease.
Economic Hardship, Age, and Financial Stress
Financial insecurity is one of the most consistent contributors to Depression. Job loss, debt, difficulty paying rent, and uncertainty about the future create ongoing stress that affects sleep, relationships, and self-esteem, and limits access to healthy food, healthcare, and social connection. This relationship is not simply psychological; it reflects measurable biological stress responses involving cortisol and inflammation.
Young adults have experienced some of the sharpest recent increases in reported Depression. Gallup found that among adults ages 18 to 29, the depression rate rose from 13% in 2017 to 26.7% in 2025, one of the largest increases of any group tracked. Income appears closely tied to this pattern: respondents with an annual household income under $24,000 reported a depression rate of 35.1% in 2025. Some of the rise among younger adults may reflect the lasting effects of coming of age during the COVID-19 pandemic, though this connection is not yet fully established.
Food insecurity, a lack of reliable access to adequate food, is a related and well-documented risk factor. A 2024 umbrella review in Psychiatry Research, which pooled findings across 26 meta-analyses and systematic reviews, found a significant association between food insecurity and increased risk of MDD, a relationship that can begin as early as pregnancy when nutritional access is limited.
Employment and Meaningful Work
Employment provides more than income. It offers structure, purpose, social interaction, and a sense of competence. Unemployment, underemployment, and toxic work environments can undermine these benefits, and workplace discrimination, burnout, and chronic job insecurity are increasingly recognized as contributors to Depression. Meaningful and supportive work environments, by contrast, can help protect mental health.
Housing Instability and Neighborhood Environment
Stable housing is an important foundation for mental well-being. People who experience frequent moves, overcrowding, unsafe living conditions, or the threat of eviction often report higher rates of Depression. Neighborhood characteristics matter as well: access to parks, walkable streets, and community spaces encourages physical activity and social engagement, both of which support emotional health, while environments marked by noise, violence, or disorder can increase chronic stress.
Marginalization, Discrimination, and Social Exclusion
Experiences of racism, homophobia, and other forms of discrimination can have real mental health consequences, often producing chronic vigilance, internalized stigma, and feelings of exclusion. Gallup polling found that the reported depression rate among Black adults in the United States rose from 12.3% in 2017 to 18% in 2025, and among Hispanic adults from 13% to 17.7% over the same period. A separate 2021 study in JAMA Psychiatry, examining survey data from the early 1990s and early 2000s, found a related but more complicated pattern: Black and Latino adults had lower overall rates of MDD than White adults during that period, but experienced significantly higher levels of depression-related severity and disability, a gap researchers linked to disparities in access to treatment.
Gender differences are also notable. The share of women reporting Depression in Gallup’s polling rose from 17.6% in 2017 to 23.4% in 2025, and a broader research review found that women may be up to twice as likely as men to experience Depression, a gap connected in part to higher rates of intimate partner violence and disordered eating among women, along with a disproportionate share of domestic and childcare responsibilities. People in the LGBTQ+ community face a distinct risk as well, since ongoing discrimination, whether interpersonal or embedded in policy, is consistently associated with poorer mental health outcomes.
Childhood Adversity and Early Social Environment
The social environment in childhood can shape mental health for decades. Adverse childhood experiences, including neglect, abuse, parental conflict, and household instability, are among the strongest known risk factors for Depression. Early adversity can affect stress-response systems and brain development, increasing sensitivity to future stressors, though supportive relationships later in life can help offset some of these long-term effects.
Sleep and Lifestyle Behaviors
Many lifestyle habits linked to Depression are themselves shaped by social circumstances. Poor sleep, sedentary behavior, and excessive screen time are associated with higher depression risk, while regular exercise and social engagement are protective. Sleep in particular appears to be a meaningful protective factor: adequate sleep duration is associated with lower Depression risk even among people with genetic vulnerability to the condition, while poor sleep is both a common symptom of Depression and, in some cases, an early sign of other mood conditions.
Why Social Factors Affect the Brain
Social stressors do not only influence emotions in the moment; they produce measurable biological changes. Chronic isolation and adversity have been linked to elevated cortisol levels, increased inflammation, reduced neuroplasticity, disrupted sleep and circadian rhythms, and altered activity in mood-regulating brain circuits. These are many of the same biological systems targeted by effective Depression treatments, including medication, exercise, and TMS. We describe how TMS acts on these circuits directly in our post on how TMS improves brain connectivity and neuroplasticity.
How TMS Fits Into a Comprehensive Treatment Approach
Mid City TMS specializes in evidence-based treatments for Depression, including TMS. TMS uses focused magnetic pulses to stimulate underactive brain regions involved in mood regulation, particularly the left dorsolateral prefrontal cortex. It is FDA-cleared for MDD and is especially valuable for patients who have not improved sufficiently with antidepressant medication. TMS addresses the biological component of Depression directly, by supporting neuroplasticity and helping normalize dysfunctional brain networks. Because Depression is shaped by social factors as well as biological ones, the best outcomes often occur when TMS is combined with attention to a patient’s broader life circumstances, along with options like esketamine for patients who need a more rapid-acting approach.
Practical Ways to Improve Social Determinants of Mental Health
While some circumstances are difficult to change quickly, small steps can make a meaningful difference:
- Reaching out to trusted friends or family
- Joining a community or support group
- Considering psychotherapy as part of a broader care plan
- Addressing financial or housing concerns with community resources
- Engaging in volunteer work or other meaningful activity
- Reducing social isolation through structured routines
Even modest increases in connection and support can have a real effect on mood.
A More Complete Understanding of Depression
Depression is not adequately explained by biology alone. It is a condition shaped by the interaction of brain biology, life experience, and the social world around a person. Among the many social influences, loneliness and lack of support stand out as particularly powerful risk factors, while meaningful connection remains one of the strongest protective factors identified in the research. Economic stability, safe housing, fair treatment, and supportive communities also play a real role in mental health.
The Mid City TMS Perspective
At Mid City TMS, we take a comprehensive approach to treating Depression, understanding that successful treatment often requires addressing both the neurobiological and psychosocial contributors to illness. For patients whose Depression has not responded adequately to medication, TMS offers a safe, noninvasive, and well-supported treatment option. By combining advanced neuromodulation with attention to social support and life circumstances, we aim to help patients toward meaningful, lasting recovery. Learn how Mid City TMS can help and contact us today to schedule a consultation.
Sources
- Kirkbride, J. B., Anglin, D. M., Colman, I., Dykxhoorn, J., Jones, P. B., Patalay, P., Pitman, A., Soneson, E., Steare, T., Wright, T., & Griffiths, S. L. (2024). The social determinants of mental health and disorder: evidence, prevention and recommendations. World psychiatry : official journal of the World Psychiatric Association (WPA), 23(1), 58–90. https://doi.org/10.1002/wps.21160
- Alon, N., Macrynikola, N., Jester, D. J., Keshavan, M., Reynolds, C. F., Saxena, S., Thomas, M. L., Torous, J., & Jeste, D. V. (2024). Social determinants of mental health in major depressive disorder: Umbrella review of 26 meta-analyses and systematic reviews. Psychiatry Research, 335, 115854. https://doi.org/10.1016/j.psychres.2024.115854
- Flores, M. W., Moyer, M., Rodgers, C. R. R., & Cook, B. L. (2021). Major Depressive Episode Severity Among Adults from Marginalized Racial and Ethnic Backgrounds in the US. JAMA psychiatry, 78(11), 1279–1280. https://doi.org/10.1001/jamapsychiatry.2021.2485