You can eat fish after thyroidectomy, but in moderation. Fish is rich in vitamin A, vitamin E, folic acid, phosphorus, potassium, magnesium, calcium and other nutrients, and eating fish after thyroidectomy can help replenish nutrients and promote health. Although fish has a certain nutritional value, it is not advisable to eat a large amount of it at one time, so as not to cause indigestion and other uncomfortable symptoms. After total thyroidectomy, patients should ensure that their diet is nutritious, balanced and comprehensive, and should also take levothyroxine sodium tablets as prescribed by the doctor for hormone replacement therapy to maintain the level of thyroid hormones within a reasonable range. Patients after total thyroidectomy can go to the hospital and consult a professional doctor if they are not sure about their diet.