COVID-19 as a trigger of cerebral venous sinus thrombosis in a patient with autoimmune hyperthyroidism: a case report.

Clinicians should be aware that even mild COVID-19 could precipitate CVST, especially in presence of other risk factors. Further studies should be conducted to evaluate the effects of mild COVID-19 on existing prothrombic states, including autoimmune hyperthyroidism. Furthermore, a high index of suspicion towards a secondary cause must be maintained for headaches in COVID-19, as it may indicate a serious etiology, including CVST.