What are risk factors for thyroid cancer?

Papillary cancer (radiation exposure, inherited condition (FAP), family hx (5% runs in families), gender (3x more in women but in men rapid and spreads quickly)) Follicular thyroid cancer (low-iodine diet, familial conditions (inherited, Werner's / Cowden's)) Medullary thyroid cancer MTC (family hx 25% inheritied RET gene) Nodules common but cancer is rare (5% of all nodules)