There is no obvious relationship between thyroid nodules and hiccups, but there is only one possibility that thyroid nodules may cause hiccups, and that is when thyroid cancer metastasizes to the cervical lymph nodes and the cervical lymph nodes have infiltrative adhesions to the phrenic nerve, which may cause the diaphragm to lift up and the diaphragm to be stimulated. For thyroid nodules, the nature of the nodule should be determined by ultrasound. If the nodule is considered benign, it should be observed regularly. There are many reasons for hiccups, mainly due to subdiaphragmatic fluid or damage to the phrenic nerve, so in this case an abdominal ultrasound is needed to rule out abdominal cavity lesions. If you have a history of abdominal surgery, you need to rule out the possibility of subdiaphragmatic fluid or subdiaphragmatic abscess.