Dietary contraindications for thyroid nodules should be determined according to the condition. If thyroid nodules are accompanied by hyperthyroidism, iodine intake should be limited, and consumption of seaweed and marine fish is not recommended. If thyroid nodules are accompanied by hypothyroidism, long-term consumption of foods with goiter-causing effects, such as cabbage, should be avoided in large quantities. 1. Excessive or insufficient iodine intake can increase the prevalence of nodules. For nodules with normal thyroid function, it is advisable to have an “iodine-adapted diet”, consuming iodized salt and seafood. 2. If the thyroid nodules have autonomous function, leading to hyperthyroidism, it is advisable to “limit iodine diet”, i.e. consume non-iodized salt and avoid eating seafood. 3. For nodules combined with Hashimoto’s thyroiditis, a “low iodine diet” is recommended, i.e. consuming iodized salt and restricting high iodine foods. Hashimoto’s thyroiditis combined with thyroid nodules and hypothyroidism, should avoid eating goiter-causing foods, common foods such as cabbage, cassava can release thiocyanic acid root can inhibit the thyroid peroxidase enzyme and lead to goiter, especially when iodine deficiency is more likely to occur. Patients found with thyroid nodules are advised to seek medical advice in time, and to have a reasonable diet and treatment under the doctor’s guidance.