Cannabis abuse linked to psychiatric symptoms but not thyroid or cardiovascular changes
In a study of 40 cannabis-dependent patients vs 40 healthy controls, cannabis abuse was associated with significant psychiatric symptoms but did not significantly alter thyroid hormones or cardiovascular parameters, likely due to tolerance development.
Quick Facts
What This Study Found
Cannabis-dependent patients showed highly significant differences (P < 0.001) in positive, negative, and general psychopathology scores on the PANSS compared to controls. Among patients, 47.5% had schizophrenia, 20% schizoaffective symptoms, 10% manic symptoms, and 22.5% both manic and psychotic symptoms. Thyroid hormones (TSH, T3, T4) and cardiovascular parameters did not differ significantly between groups.
Key Numbers
40 patients vs 40 controls; 47.5% schizophrenia; PANSS scores P < 0.001; thyroid and cardiovascular parameters non-significant
How They Did This
Prospective multicenter study comparing 40 cannabis-dependent patients with psychotic symptoms (selected by DSM-IV criteria and urine testing) to 40 healthy controls. Thyroid hormones measured by immunoassay, psychiatric symptoms by PANSS, and cardiovascular parameters assessed.
Why This Research Matters
The dissociation between significant psychiatric effects and non-significant thyroid/cardiovascular changes in chronic cannabis users suggests tolerance may develop to some physiological effects while psychiatric vulnerability persists or worsens.
The Bigger Picture
The finding that the body adapts (develops tolerance) to cannabis's thyroid and cardiovascular effects while psychiatric effects remain prominent suggests different biological systems respond differently to chronic exposure.
What This Study Doesn't Tell Us
Small sample. Cross-sectional comparison cannot determine whether cannabis caused psychiatric symptoms. All patients already had psychotic symptoms at enrollment. No dose-response analysis.
Questions This Raises
- ?Would thyroid effects appear in non-tolerant users?
- ?Does tolerance to cardiovascular effects provide false reassurance while psychiatric risk persists?
- ?Are the psychiatric symptoms truly cannabis-caused or pre-existing?
Trust & Context
- Key Stat:
- Significant psychiatric symptoms (P < 0.001) but non-significant thyroid/cardiovascular changes
- Evidence Grade:
- Small multicenter study with validated psychiatric assessments, but cannot establish causation and patients were pre-selected for psychotic symptoms.
- Study Age:
- Published in 2021.
- Original Title:
- Clinical Investigation on the Impact of Cannabis Abuse on Thyroid Hormones and Associated Psychiatric Manifestations in the Male Population.
- Published In:
- Frontiers in psychiatry, 12, 730388 (2021)
- Authors:
- Muzaffar, Anum, Ullah, Sami, Subhan, Fazal, Nazar, Zahid, Hussain, Syed Mehdi, Khuda, Fazli, Khan, Abuzar, Khusro, Ameer, Sahibzada, Muhammad Umar Khayam, Albogami, Sarah, El-Shehawi, Ahmed M, Emran, Talha Bin, Javed, Binish, Ali, Javed
- Database ID:
- RTHC-03371
Evidence Hierarchy
Enrolls participants and follows them forward in time.
What do these levels mean? →Frequently Asked Questions
Does cannabis affect thyroid hormones?
Not in this study. Despite chronic cannabis dependence, thyroid hormone levels (TSH, T3, T4) did not significantly differ between cannabis-dependent patients and healthy controls, which researchers attributed to tolerance.
What psychiatric symptoms were found?
Among 40 cannabis-dependent patients, 47.5% had schizophrenia, 20% schizoaffective symptoms, and others had manic or combined manic-psychotic symptoms, all with significantly elevated PANSS scores.
Read More on RethinkTHC
Cite This Study
https://rethinkthc.com/research/RTHC-03371APA
Muzaffar, Anum; Ullah, Sami; Subhan, Fazal; Nazar, Zahid; Hussain, Syed Mehdi; Khuda, Fazli; Khan, Abuzar; Khusro, Ameer; Sahibzada, Muhammad Umar Khayam; Albogami, Sarah; El-Shehawi, Ahmed M; Emran, Talha Bin; Javed, Binish; Ali, Javed. (2021). Clinical Investigation on the Impact of Cannabis Abuse on Thyroid Hormones and Associated Psychiatric Manifestations in the Male Population.. Frontiers in psychiatry, 12, 730388. https://doi.org/10.3389/fpsyt.2021.730388
MLA
Muzaffar, Anum, et al. "Clinical Investigation on the Impact of Cannabis Abuse on Thyroid Hormones and Associated Psychiatric Manifestations in the Male Population.." Frontiers in psychiatry, 2021. https://doi.org/10.3389/fpsyt.2021.730388
RethinkTHC
RethinkTHC Research Database. "Clinical Investigation on the Impact of Cannabis Abuse on Th..." RTHC-03371. Retrieved from https://rethinkthc.com/research/muzaffar-2021-clinical-investigation-on-the
Access the Original Study
Study data sourced from PubMed, a service of the U.S. National Library of Medicine, National Institutes of Health.
This study breakdown was produced by the RethinkTHC research team. We analyze and report published research findings without making health recommendations. All interpretations are based solely on the published abstract and study data.