Illustration symbolizing the connection between maternal thyroid health and child development during pregnancy.

Thyroid Troubles During Pregnancy: Is There a Link to Cerebral Palsy?

Samir D’Costa monogram
Samir D’Costa in Health & Wellness October 2026 • 4 min read.

"Exploring the connection between maternal thyroid disorders and the risk of cerebral palsy in children: what the research says."


Cerebral palsy (CP) is the most common physical disability affecting children, impacting motor skills and coordination. While the causes of CP are complex and not fully understood, recent research has begun to explore potential links between a mother's health during pregnancy and the child's risk of developing CP.

One area of interest is the role of thyroid hormones during pregnancy. The thyroid gland produces hormones essential for brain development, and disruptions in thyroid function during pregnancy could potentially affect a child's neurological development. This article examines a population-based cohort study that investigated the association between maternal thyroid disorders and the risk of cerebral palsy in children.

This study aimed to determine if maternal thyroid disorders are associated with increased risk of cerebral palsy, providing additional clarity for mothers.

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Research Landscape on Maternal Thyroid Disorders and Cerebral Palsy

Multiple studies have investigated the link between maternal thyroid disorders and cerebral palsy, with some using register-based data and logistic regression (Reference 1). A systematic review found conflicting results across studies on maternal thyroid hormone insufficiency and neurodevelopmental disorders (Reference 2). A meta-analysis focused on specific neurodevelopmental conditions such as intellectual disability and autism spectrum disorders (Reference 3).

Methodological Challenges in Studying the Association

Standard approaches to studying this association include large cohort studies, register-based data, and meta-analyses. Limitations often involve confounding variables, measurement errors in thyroid function assessment, and heterogeneity in cerebral palsy definitions. These challenges can lead to inconsistent findings across studies.

Early Hypotheses Linking Thyroid Function to Cerebral Palsy

Cerebral palsy is the most common motor disability in childhood, yet its causes remain poorly understood. Researchers have hypothesized that prenatal thyroid hormone disturbances may contribute to cerebral palsy risk. This hypothesis has motivated population-based cohort studies examining maternal thyroid disorders in relation to cerebral palsy subtypes.

Decoding the Study: Maternal Thyroid Issues and Cerebral Palsy Risk

Illustration symbolizing the connection between maternal thyroid health and child development during pregnancy.

This research involved two study populations. The first included 1,270,079 children born in Denmark between 1979 and 2007, identified through nationwide registers. The second group consisted of 192,918 children born between 1996 and 2009, participating in the Danish National Birth Cohort and the Norwegian Mother and Child Cohort study, combined in the MOthers and BAbies in Norway and Denmark (MOBAND) collaboration.

Researchers collected data from registers and self-reported information on maternal thyroid disorders, analyzing this information in relation to cerebral palsy diagnoses and its subtypes (unilateral and bilateral spastic CP). Children were followed from one year of age to six years, with CP diagnoses verified through nationwide registers.

  • Hypothyroidism: Identified in 1.0% of mothers in register data.
  • Hyperthyroidism: Recognized in 0.8% of mothers in register data.
  • Unclassifiable Thyroid Disorder: Found in less than 0.1% of mothers in register data.
  • MOBAND Data: 1.6% of mothers reported a thyroid disorder during pregnancy.
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Current Trends in Investigating Thyroid-Cerebral Palsy Links

Recent research continues to explore the relationship between maternal thyroid disorders and cerebral palsy, with a focus on specific subtypes and timing of exposure. Systematic reviews and meta-analyses aim to synthesize evidence, but results remain mixed. Emerging studies consider additional factors such as iodine status and autoimmune thyroiditis.

Null Findings and Methodological Discrepancies

Some studies have failed to find a significant association between maternal thyroid disorders and cerebral palsy, suggesting other factors may be more influential. Methodological differences, such as varying definitions of thyroid dysfunction and cerebral palsy, may explain discrepancies. These failures underscore the need for standardized protocols and larger sample sizes.

Comparing Study Designs and Outcomes

Comparative analyses reveal that studies using different methodologies yield varying results. Cohort studies with objective thyroid measurements tend to show stronger associations than those relying on self-reported data. Cross-cultural differences in iodine intake and healthcare access may also influence outcomes.

The study found that maternal thyroid disorder overall was not related to bilateral spastic cerebral palsy, but maternal thyroid disorder identified in pregnancy was associated with increased risk of unilateral spastic cerebral palsy. Researchers recommend further studies using maternal blood samples to validate these findings.

What's Next? Unpacking the Implications and Future Research

While this study provides valuable insights, it's essential to remember that correlation doesn't equal causation. Further research is needed to fully understand the complex relationship between maternal thyroid disorders and cerebral palsy risk. Future studies should focus on analyzing maternal blood samples to assess thyroid hormone levels directly and explore the underlying mechanisms that might contribute to this association. This research underscores the importance of optimal thyroid management during pregnancy and highlights the need for continued investigation in this critical area of maternal and child health.

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Expert Perspectives on the Evidence Base

Experts generally agree that while there is plausible biological mechanisms linking maternal thyroid disorders to cerebral palsy, the evidence is not yet conclusive. They emphasize the importance of maintaining optimal thyroid function during pregnancy. Further research with rigorous designs is needed to inform clinical guidelines.

Research Directions and Practical Implications

Future research should focus on replicating findings using maternal blood samples to improve exposure assessment (Reference 2). Longitudinal studies are needed to explore the long-term neurodevelopmental outcomes of offspring exposed to maternal thyroid disorders (Reference 1). Practical guidance for expectant mothers on thyroid health may help mitigate potential risks (Reference 3).

Thyroid Health as a Factor in Child Development

Maternal thyroid dysfunction during pregnancy has been linked to a range of adverse child outcomes, as shown in a systematic review and meta-analysis (Reference 1). These findings highlight the importance of screening and managing thyroid health in pregnancy. However, challenges remain in establishing causality due to confounding factors and variability in study designs.

Implications for Families and Clinical Practice

For families affected by cerebral palsy, understanding potential risk factors like maternal thyroid health can be both informative and emotionally challenging. Screening and management of thyroid disorders during pregnancy may offer a modifiable target for prevention. However, the complexity of cerebral palsy etiology means that multiple factors likely contribute.

Biological context and related evidence

In early pregnancy, the fetus depends entirely on maternal thyroid hormone; from mid-gestation, fetal hormone production works alongside the maternal system. This offers a biological reason to examine timing, but does not show that a maternal disorder produces cerebral palsy.[1]

Thyroid hormone supports brain development, including nerve-cell myelination, and insufficient myelination is often present in people with cerebral palsy. This is a possible explanatory link, not evidence that thyroid dysfunction caused the observed outcomes.[1]

Thyroid disorders have also been linked to coagulation abnormalities that could lead to ischemia or bleeding, proposed as possible pathways relevant to unilateral spastic cerebral palsy. The mechanism remains a hypothesis in this evidence.[1]

A separate child-development source notes that children with cerebral palsy are among groups at highest risk of visual impairment. Its screening examinations and parent questionnaire were not sensitive enough to detect the subtlest differences in vision development across maternal thyroid-function groups.[2]

That visual-development source also says rare outcomes were difficult to study reliably in small maternal thyroid-dysfunction groups. Separately, a review of randomized trials in women with subclinical hypothyroidism diagnosed during pregnancy found no evidence that levothyroxine improved obstetrical, neonatal, childhood IQ, or neurodevelopmental outcomes; this does not establish the effect of treatment on cerebral palsy.[2] [3]

What remains unresolved about thyroid function and cerebral palsy

  • Would measurements of maternal thyroid hormone clarify whether the elevated unilateral-spastic estimate reflects thyroid function itself or simply a disorder recorded during pregnancy? The available association does not answer that distinction.[1]
  • Why do the estimates differ between cerebral-palsy subtypes and the overall MOBAND outcome? The reported results do not establish whether this reflects real differences between outcomes or uncertainty in the estimates.[1]

Sources

  1. Maternal thyroid disorder in pregnancy and risk of cerebral palsy in the child: a population-based cohort study (pmc.ncbi.nlm.nih.gov)
  2. Maternal Thyroid Function During Pregnancy and the Child’s Linguistic and Sensory Development in the Northern Finland Birth Cohort 1986 (pmc.ncbi.nlm.nih.gov)
  3. Impact of levothyroxine therapy on obstetric, neonatal and childhood outcomes in women with subclinical hypothyroidism diagnosed in pregnancy: a systematic review and meta-analysis of randomised contr (pmc.ncbi.nlm.nih.gov)

About this Article -

Written with AI assistance from published research, and reviewed by the Mystum team. See our About page for more information.

Everything You Need To Know

1

What is the primary focus of the research linking maternal health and child development?

The main focus of the research is to explore the connection between maternal thyroid disorders and the risk of cerebral palsy in children. This investigation specifically looks at how disruptions in thyroid function during pregnancy might affect a child's neurological development, particularly in relation to the development of cerebral palsy. The study examined the association between maternal thyroid disorders and the risk of cerebral palsy in children, and also the subtypes: unilateral and bilateral spastic CP.

2

What is cerebral palsy and why is this condition significant in this research?

Cerebral palsy (CP) is the most common physical disability affecting children, and it impacts their motor skills and coordination. This research is significant because CP's causes are complex and not fully understood. The study investigated the potential link between a mother's health during pregnancy, specifically her thyroid function, and the child's risk of developing CP. Understanding this link could help improve maternal and child health outcomes, and CP diagnoses were verified through nationwide registers.

3

How did the researchers collect and analyze data on maternal thyroid disorders and cerebral palsy?

The researchers used a population-based cohort study involving two study populations. The first included children born in Denmark between 1979 and 2007, identified through nationwide registers. The second group consisted of children born in the Danish National Birth Cohort and the Norwegian Mother and Child Cohort study, combined in the MOBAND collaboration. Researchers collected data from registers and self-reported information on maternal thyroid disorders and cerebral palsy diagnoses and its subtypes (unilateral and bilateral spastic CP). They analyzed this information in relation to CP diagnoses, with CP diagnoses verified through nationwide registers.

4

What were the key findings regarding maternal thyroid disorders and the risk of cerebral palsy?

The study found that overall maternal thyroid disorder was not related to bilateral spastic cerebral palsy. However, maternal thyroid disorder identified during pregnancy was associated with an increased risk of unilateral spastic cerebral palsy. The study identified the prevalence of specific thyroid conditions: Hypothyroidism was found in 1.0% of mothers, Hyperthyroidism in 0.8%, and Unclassifiable Thyroid Disorder in less than 0.1% of mothers in the register data. In the MOBAND data, 1.6% of mothers reported a thyroid disorder during pregnancy.

5

What are the implications of the study's findings, and what future research is recommended?

The study underscores the importance of optimal thyroid management during pregnancy, while also recognizing that correlation does not equal causation. Future research should focus on analyzing maternal blood samples to assess thyroid hormone levels directly to validate these findings. This will help researchers explore the underlying mechanisms that might contribute to the association between maternal thyroid disorders and the risk of cerebral palsy. Furthermore, future studies should explore the subtypes of cerebral palsy to understand their correlation.

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