Neuroscience Blog

A comprehensive analysis of 333 studies shows elevated risk of depression, anxiety, PTSD, and cognitive dysfunction following COVID-19 infection.

A groundbreaking scoping review published in Psychiatry and Clinical Neurosciences Reports has uncovered the extensive neuropsychiatric consequences of COVID-19 infection, revealing that mental health risks remain elevated for up to two years following diagnosis.

Key Findings: COVID-19’s Lasting Mental Health Impact

Studies indicated an elevated risk of neuropsychiatric disorders post‐coronavirus disease 2019, with some risks remaining high 2 years after diagnosis. A significant prevalence of depressive, psychotic, and anxiety disorders, as well as post‐traumatic stress symptoms were noted among coronavirus disease 2019 survivors.

The comprehensive analysis examined 333 studies from around the world, making it one of the largest reviews of COVID-19’s neuropsychiatric effects to date. Researchers found that there was increased prevalence of insomnia and other sleep disturbances, mild to severe cognitive dysfunction, and eating disorders among COVID-19 survivors.

Most Common Neuropsychiatric Disorders After COVID-19

The research identified several key mental health conditions that frequently develop following COVID-19 infection:

Cognitive Dysfunction: The most prevalent long-term effect, more than 60% of studies cited major and mild neurocognitive disorders following COVID‐19 infections, ranging from mild memory problems to severe cognitive impairment.

Depression and Anxiety: These mood disorders showed consistently high prevalence rates across different time periods of the pandemic, with 192 out of 333 articles that reported on depressive disorders in confirmed cases of COVID‐19 infection and long COVID.

Post-Traumatic Stress Disorder (PTSD): Particularly common among severely ill patients, with 30.2% of post‐COVID‐19 patients affected by the disorder.

Sleep Disorders: Including insomnia and various sleep disturbances that significantly impact quality of life.

The Evolution of Neuropsychiatric Symptoms Over Time

The study revealed fascinating patterns in how mental health symptoms changed throughout the pandemic:

• 2020: Anxiety disorders were most frequently reported, followed by cognitive disorders and depression
• 2021: Anxiety remained predominant, with depression becoming the second most common
• 2022: Cognitive disorders surged to become the most reported condition
• 2023: Anxiety and depression resurged as the leading neuropsychiatric outcomes

Long COVID and Persistent Neuropsychiatric Symptoms

Neuropsychiatric symptoms present in patients with long COVID can be similar to or differ from those present during the initial SARS‐CoV‐2 infection period, including psychiatric disorders such as post‐traumatic stress disorder (PTSD), anxiety, depression, insomnia, suicidality, and amnesia. Long COVID patients also showed particularly high rates of persistent symptoms that can last months or even years after initial infection.

Brain Changes and Neuroimaging Findings

The study found compelling evidence of physical brain changes associated with mental health symptoms. Neuroimaging studies have found correlations between depressive scores and changes in brain regions such as the right hippocampus, providing biological evidence for the neuropsychiatric effects of COVID-19.

Risk Factors and Vulnerable Populations

The analysis identified several key risk factors for developing neuropsychiatric complications:

Severity of Initial Illness: The severity of the initial infection, especially in ICU‐admitted patients, appears to correlate strongly with the likelihood and severity of subsequent mental health issues.

Pre-existing Mental Health Conditions: Patients with prior psychiatric history showed elevated risks for developing new or worsened symptoms.

Demographic Factors: Certain populations, including pregnant women and healthcare workers, showed higher vulnerability to neuropsychiatric complications.

Biological Mechanisms Behind COVID-19 Mental Health Effects

The research revealed multiple pathways through which COVID-19 affects mental health:

Direct Viral Invasion: The potential mechanisms for COVID‐19‐related psychiatric disorders include direct viral invasion of the central nervous system, immune overreaction, and increased pro‐inflammatory factors.

Inflammatory Response: The systemic immune‐inflammation index, a measure of immune response and systemic inflammation based on peripheral lymphocyte, neutrophil, and platelet counts, was found to predict depressive symptoms, cognitive impairment, processing speed, verbal memory, and fluency.

Cytokine Activity: Studies showed correlations between inflammatory markers like Interleukin-6 and C-reactive protein with various neuropsychiatric symptoms.

Specific Neuropsychiatric Conditions and Their Prevalence

Psychotic Disorders: The risk for developing a psychotic disorder remains elevated for up to 2 years post COVID‐19 diagnosis, with some studies showing nearly threefold increases in likelihood.

Sleep Disorders: In one cohort study, insomnia prevalence rose from 10.6% to 27.3%, while 41.5% reported poor sleep quality following COVID-19 infection.

Eating Disorders: Particularly concerning in children and adolescents, out of the 84 patients in a study, 24 reported a loss of smell or taste following a confirmed COVID‐19 infection. Among these 24 patients, six developed a heightened focus on their eating habits, eventually culminating in anorexia nervosa.

Seizure Disorders: Risk of epilepsy or seizures remained increased at 2 years after a COVID‐19 diagnosis compared to the risk of other diagnoses.

Global Impact: Studies from 55 Countries

The research drew from studies conducted across 55 different countries, with the highest contributions from:

• Italy (61 studies)
• United States (48 studies)
• China (24 studies)
• Germany (21 studies)
• Spain (15 studies)
• Brazil (15 studies)

This global scope ensures the findings are applicable across diverse populations and healthcare systems.

Clinical Implications and Treatment Approaches

The study’s findings have significant implications for healthcare systems worldwide:

Systematic Monitoring: Healthcare systems should implement systematic long‐term follow‐up and monitoring programs, establish multidisciplinary teams to address varied mental health needs, and develop targeted screening protocols for high‐risk groups to facilitate early detection and intervention.

Multidisciplinary Care: The complexity of post-COVID neuropsychiatric symptoms requires coordinated care involving psychiatrists, neurologists, psychologists, and primary care physicians.

Early Detection: Routine cognitive assessments using tools like the Montreal Cognitive Assessment may help identify patients experiencing significant post-COVID cognitive impairment.

Long-Term Mental Health Surveillance

The research emphasizes the critical need for extended monitoring of COVID-19 survivors. Long‐term monitoring and early interventions are essential to mitigate these risks and improve patient outcomes, particularly given that some neuropsychiatric effects can persist for years following initial infection.

Future Research and Healthcare Planning

This comprehensive review highlights several areas requiring immediate attention:

Resource Allocation: Healthcare systems need to expand mental health services and capacity to address the growing population of COVID-19 survivors with neuropsychiatric complications.

Treatment Development: More research is needed to develop effective therapeutic approaches specifically targeting post-COVID neuropsychiatric symptoms.

Prevention Strategies: Understanding risk factors can help identify and protect vulnerable populations from severe neuropsychiatric consequences.

Implications for Public Health Policy

The findings underscore the importance of considering mental health as a core component of post-COVID care. Public health policies should prioritize mental health support, integrating services into post‐COVID‐19 care plans and allocating resources to bolster mental health infrastructure.

The Hidden Pandemic: Long-Term Mental Health Crisis

This research reveals what many experts are calling a “hidden pandemic” of mental health disorders following COVID-19 infection. With millions of people worldwide having contracted COVID-19, the scale of potential neuropsychiatric consequences represents an unprecedented public health challenge.

The study’s comprehensive analysis of over 330 research papers provides the most complete picture to date of COVID-19’s lasting impact on mental health, serving as a crucial resource for healthcare providers, policymakers, and researchers working to address this emerging crisis.

Story Source

Yousufzai W, Heo A, Gu K, Sun E, Lopez G, Balamurali S, Adjei-Mosi J, Shin R, Stuart DB, Edwards P, Baronia R, Amor W, McMahon T. First episode of psychiatric and neuropsychiatric disease among patients infected with COVID-19: A scoping review. PCN Rep. 2025 Jun 25;4(2):e70146. doi: 10.1002/pcn5.70146. PMID: 40567947; PMCID: PMC12188623.