Thyroid gland

Key facts Your thyroid is a small, bow-shaped gland that sits in the front of your neck. Your thyroid gland makes 3 thyroid hormones: thyroxine (T4), triiodothyronine (T3) and calcitonin. Thyroid problems, such as an overactive or underactive thyroid, are common. What is the thyroid gland? Your thyroid is a small, bow-shaped gland. It sits in the front of your neck, just below your Adam’s apple. What does my thyroid gland do? Your thyroid gland makes 3 hormones: thyroxine (T4) triiodothyronine (T3) calcitonin Thyroxine (T4) is the main hormone made in your thyroid. Thyroxine is changed into triiodothyronine (the active thyroid