The situation of not being able to eat iodine-containing food after thyroidectomy may refer to the fact that after thyroid cancer resection, iodine fasting is needed for the sake of iodine 131 nail-cleaning treatment, and iodine-containing food including iodized salt, kelp, nori and so on are not allowed to be eaten during the period of iodine fasting. After thyroid cancer resection, if you need to further iodine 131 nail clearance treatment, you need to ban iodine before treatment, iodine ban is to maintain the body’s iodine starvation, more conducive to iodine 131 treatment. Foods that can not be eaten with iodine prohibition, salt and seasonings such as iodized salt, sea salt, soy sauce, oyster sauce, seafood and fish such as kelp, seaweed, hairy vegetables, shrimp, shellfish, crabs and marine fish, milk or dairy products including cream, cheese, butter, yogurt, ice cream, etc., processed products such as bacon, ham, barbecued pork and so on, as well as canned fruits, pickles, and so on. An iodine-free diet is recommended under doctor’s supervision after thyroidectomy.