Is tea bad for thyroid?

There are different types of thyroid disorders ranging from hypo or hyperthyroidism to thyroid cancer, each needing different diet restrictions. On a general note, research has shown that green tea and black tea (Green > black) both have goitrogenic and antithyroidal properties. On the other hand, few studies have shown that tea can reduce risk of thyroid cancer. More detailed studies are needed in this area. Hence, it is best to avoid tea or take it in moderation along with regular check on thyroid tests.