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Stress and Mental Health

Chronic stress profoundly affects mental health, significantly influencing mood, behavior, and overall quality of life. Research closely links chronic stress with mental health conditions such as depression, anxiety, and substance use disorders. Ongoing exposure to stress can lead to physiological and psychological changes, initiating a cycle of emotional distress and maladaptive coping mechanisms.
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Schizophrenia01:17

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Schizophrenia, a term introduced by Swiss psychiatrist Eugen Bleuler in 1911, describes a severe psychological disorder marked by profound disruptions in attention, thought processes, language, emotion, and interpersonal relationships. The core feature of schizophrenia is psychosis — a state characterized by a fundamental detachment from reality. This disconnection manifests through distorted logic, impaired perception, and atypical behavior, severely affecting the lives of those diagnosed.
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Related Experiment Video

Updated: Jul 6, 2026

A New Method for Inducing a Depression-Like Behavior in Rats
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Published on: February 22, 2018

Schizophrenia and city life.

G Lewis1, A David, S Andréasson

  • 1Section of Epidemiology and General Practice, Institute of Psychiatry, Denmark Hill, London, UK.

Lancet (London, England)
|July 18, 1992
PubMed
Summary

Growing up in cities increases schizophrenia risk by 1.65 times, challenging the "geographical drift" theory. Environmental factors in urban settings likely contribute to this higher incidence of schizophrenia.

Area of Science:

  • Epidemiology
  • Psychiatry
  • Environmental Health

Background:

  • Schizophrenia prevalence and hospital admission rates are higher in urban areas compared to rural settings.
  • The "geographical drift" hypothesis suggests individuals with schizophrenia move to cities due to their illness, but this remains largely unverified.

Purpose of the Study:

  • To investigate the association between an individual's place of upbringing and the incidence of schizophrenia.
  • To determine if urban upbringing independently increases schizophrenia risk, independent of other known risk factors.

Main Methods:

  • Utilized data from a large cohort of 49,191 male Swedish conscripts.
  • Linked conscript data with the Swedish National Register of Psychiatric Care to track schizophrenia diagnoses.
  • Employed statistical analysis to assess the incidence of schizophrenia based on upbringing location (urban vs. rural).

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Main Results:

  • Men raised in urban environments had a 1.65 times higher incidence of schizophrenia compared to those raised in rural areas (95% CI 1.19-2.28).
  • This association remained significant even after adjusting for potential confounding factors like cannabis use, parental divorce, and family psychiatric history.

Conclusions:

  • The findings suggest that environmental factors prevalent in urban settings, rather than self-selection (geographical drift), contribute to the increased risk of schizophrenia.
  • Undetermined environmental exposures in cities are implicated as a significant risk factor for developing schizophrenia.