Hello,
Hiatal Hernia presents as an Acid Reflux and pain in the chest and upper abdomen.
This can be a hiatal hernia, or a possible scarring of the Esophagus caused by treatments for the Thyroid Cancer.
I would advise you to see a doctor and have Barium Swallow X ray test or an Esophagoscopy done, that would help in reaching a diagnosis.
Kind Regards, Dr.Joshi
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Doctor
Medical Diagnostics : X ray, CT Scan, MRI, Ultrasound, Angio. Caring Doctor. Your Health, First !