Patients after iodine 131 treatment can eat green onions. Iodine 131 can be used for the treatment of hyperthyroidism and thyroid cancer, and it is necessary to pay attention to a low iodine diet for a period of time after the treatment, and avoid iodine-rich foods such as kelp and nori, etc. For more details, please consult with your specialist. Onion can be used as a seasoning or a vegetable, and can be consumed by patients after iodine 131 treatment without any special effect on their condition, but it has a certain degree of irritation, so it is recommended to consume it in moderation. Patients receiving iodine 131 treatment should also pay attention to rest, avoid contact with pregnant women and infants for the time being, and follow the doctor’s instruction to review the thyroid function and thyroid ultrasound after treatment, and hormone replacement therapy should be carried out in case of hypothyroidism.