Psychosis Rates Rising in Younger Generations: Canadian Study

A large-scale study of over 12 million people in Ontario, Canada, reveals a concerning trend: younger generations are being diagnosed with psychotic disorders, such as schizophrenia, at higher rates and younger ages than previous generations. The research, published in the Canadian Medical Association Journal, analysed data from individuals born between 1960 and 2009.

Rising Rates of Psychotic Disorders

Researchers found a significant 60% increase in new cases of psychosis among individuals aged 14 to 20 between 1997 and 2023, rising from 62.5 to 99.7 cases per 100,000 people. This increase is particularly pronounced in more recent birth cohorts. For example, those born between 2000 and 2004 are estimated to have a 70% higher rate of diagnosis compared to those born between 1975 and 1979.

The study also showed a 37.5% increase in the total number of people diagnosed with a psychotic disorder by age 30 for those born from 1990 to 1994, when compared to those born from 1975 to 1979.

Did You Know? The study included data from 12.2 million people born in Ontario, with 152,587 ultimately diagnosed with a psychotic disorder.

Who is Most Affected?

While the increase in psychosis is consistent across both males and females, males continue to be at a higher risk of diagnosis. Individuals diagnosed with a nonaffective psychotic disorder – those not linked to mood disorders – are more likely to be male, reside in lower-income neighborhoods, be long-standing residents of Canada and have a history of receiving care for mental health and substance use issues.

Similar increases in schizophrenia diagnoses among younger individuals have been observed in recent studies conducted in Denmark and Australia, suggesting this trend may extend beyond Canada.

Expert Insight: The observed increases in psychotic disorder diagnoses highlight the complex interplay of factors impacting mental health in younger generations. Understanding these factors is crucial for developing effective prevention and early intervention strategies.

Potential Contributing Factors

Researchers suggest several potential reasons for these rising rates, including increased older parental age, socioeconomic and migration-related stressors, and adverse childhood experiences. Substance use, particularly cannabis, stimulants, hallucinogens, and synthetic drugs, is also identified as a leading possibility, as substance use in Canada has increased over the past two decades.

Dr. Daniel Myran emphasizes the need for further research, stating, “We don’t yet know what’s driving these changes, and it’s likely there isn’t a single explanation. Understanding what’s behind this trend will be critical to prevention and early support.”

Frequently Asked Questions

What is a psychotic disorder?

The study refers to psychotic disorders, such as schizophrenia, which are mental health conditions that affect a person’s ability to think, feel, and behave clearly.

Which birth cohorts are most affected?

The increases in new cases are occurring in more recent birth cohorts, beginning with those born in the 1980s and becoming more pronounced in those born in the 2000s.

What role might substance use play?

Substance use – including cannabis, stimulants, hallucinogens, and synthetic drugs – is identified as a leading possibility contributing to the rising rates of psychosis, particularly when initiated earlier in life.

As research continues, will these trends continue, and what proactive measures can be taken to support the mental health of younger generations?