Hyperthyroidism did iodine 131 diarrhea may be and iodine 131 allergy, thyroid function did not return to normal, gastrointestinal tract dysfunction and other factors related to the need for treatment according to the specific causes. 1. Iodine 131 allergy: Hyperthyroidism patients may be allergic to iodine, which leads to nausea, vomiting and other adverse reactions, and can be treated with anti-allergic drugs, such as loratadine tablets, chlorpheniramine maleate tablets and other drugs. 2. Abnormal thyroid function: after iodine 131 for hyperthyroidism, abnormal thyroid function may occur for a short time, such as hypothyroidism, etc., diarrhea and other symptoms can occur, you can follow the doctor’s instructions to take levothyroxine sodium tablets for the treatment of hypothyroidism. 3. Gastrointestinal dysfunction: hyperthyroidism patients may have diarrhea due to gastrointestinal dysfunction, which can be treated with medications to improve gastrointestinal function under the guidance of a doctor. It is recommended that when the symptoms are serious, consult a doctor in time and follow the doctor’s instructions to carry out scientific and effective treatment, and not blindly use drugs on their own.