Thyroid Autoimmunity Often Appears Alongside Type 1 Diabetes in Children

Type 1 diabetes and thyroid autoimmunity are both conditions where the immune system mistakenly attacks the body's own cells. A new study published in Frontiers in Endocrinology examined whether these two autoimmune conditions appear together in children and adolescents newly diagnosed with Type 1 diabetes.

Researchers reviewed medical records from 122 children and adolescents diagnosed with Type 1 diabetes between January 2022 and December 2024 at Qingdao University Affiliated Women's and Children's Hospital. They tested blood samples for islet autoantibodies—markers of Type 1 diabetes—and thyroid autoantibodies—markers of thyroid autoimmunity.

The study found that 42 of the 122 children (34.4%) tested positive for thyroid autoantibodies at the time of Type 1 diabetes diagnosis. This suggests that thyroid screening may be important for newly diagnosed Type 1 diabetes patients, though further research is needed to determine clinical recommendations.

Children with thyroid autoantibodies were slightly older on average (7.8 years) compared to those without thyroid autoantibodies (6.6 years). This small age difference may reflect how autoimmunity develops and accumulates over time.

The research identified important patterns in which islet autoantibodies occurred alongside thyroid autoimmunity. Children who tested positive for thyroid autoantibodies were significantly more likely to carry GADA and IAA islet autoantibodies compared to those without thyroid autoimmunity.

GADA positivity was particularly notable: 60.9% of thyroid autoantibody-positive children had GADA, versus 41.4% of those without thyroid autoimmunity. Similarly, IAA was found in 33.3% of the thyroid autoantibody-positive group but only 11.3% of the thyroid autoantibody-negative group. The statistical analysis suggested that GADA positivity made thyroid autoimmunity about three times more likely.

The study confirmed that most children newly diagnosed with Type 1 diabetes (84.4%) had at least one islet autoantibody. The most common was IA-2A (present in 64.8% of patients), while ZnT8A was the rarest (3.3%). No child tested positive for all five islet autoantibodies examined.

These findings suggest that Type 1 diabetes and thyroid autoimmunity may share underlying immune mechanisms, or that certain people's immune systems are more prone to attacking multiple organ systems. Further research could help clarify why these conditions often appear together and whether monitoring for both conditions at diagnosis might improve long-term care for young patients.

Source: Frontiers in endocrinology. Evidence type: PubMed indexed literature. Type1Cure is an information and intelligence hub, not a medical advice service. This article summarizes published research and does not provide diagnosis, treatment, or personal medical guidance. Always talk to your own care team before changing anything about your Type 1 diabetes management.