**5. Conclusions**

This study showed that patients with a diagnosis of Hashimoto's disease during the COVID-19 pandemic are at a higher risk of insomnia, depression and anxiety than patients with other chronic diseases. Therefore, people with Hashimoto's disease during the pandemic require appropriate medical support, information, stress reduction and rest.

The result of our study may help the governmental and medical community in formulating comprehensive interventions to prevent psychological problems among chronic disease clients related to COVID-19.

**Author Contributions:** Conceptualization, P.W.; Formal analysis, P.W., A.S. and I.R.; Investigation, P.W. and A.S.; Methodology, P.W.; Supervision, I.R.; Writing—original draft, P.W., A.S. and I.R.; Writing—review and editing, P.W., A.S. and I.R. All authors have read and agreed to the published version of the manuscript.

**Funding:** This research received no external funding.

**Institutional Review Board Statement:** The study was conducted according to the guidelines of the Declaration of Helsinki, and approved by the Bioethics Committee of the Pomeranian Medical University in Szczecin was received (KB-0012/26/04/2020/Z; 26.04.2020).

**Informed Consent Statement:** Informed consent was obtained from all subjects involved in the study.

**Data Availability Statement:** All data that support the findings of this study are available upon request from the corresponding author.

**Conflicts of Interest:** The authors have declared that no competing interests exist.
