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Complex Interactions Between Abnormal Thyroid Function and Neurodevelopmental Disorders: A Mendelian Randomization
Neuroendocrinology
|July 16, 2026
Summary
Hypothyroidism may be linked to tic disorders (TD), but not attention-deficit/hyperactivity disorder (ADHD) or autism spectrum disorder (ASD). This study found no causal link between neurodevelopmental disorders and hyperthyroidism.
Area of Science:
- Neuroscience
- Genetics
- Endocrinology
Background:
- Neurodevelopmental disorders (NDDs) like ADHD, ASD, and TD significantly impact social and emotional functions.
- Emerging research suggests a potential link between NDDs and thyroid dysfunction.
- Understanding this relationship is crucial for integrated healthcare approaches.
Purpose of the Study:
- To investigate the association between NDDs (ADHD, ASD, TD) and thyroid dysfunction (hyperthyroidism and hypothyroidism).
- To explore potential causal pathways using genetic data.
Main Methods:
- Utilized Mendelian randomization (MR) analysis, a robust method employing extensive genomic data.
- Examined associations between genetic variants and NDDs, hyperthyroidism, and hypothyroidism.
Main Results:
- Found a significant association between hypothyroidism and tic disorders (TD).
- No significant associations were observed between genetic variants and hypothyroidism, ADHD, or ASD.
- No reliable causal link was established between ADHD, ASD, or TD and hyperthyroidism.
Conclusions:
- Hypothyroidism may represent a risk factor or be associated with tic disorders.
- No evidence supports a causal relationship between ADHD, ASD, or TD and hyperthyroidism.
- Highlights the need for early diagnosis and integrated care for NDDs and potential thyroid dysfunction.
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