Approx. 5 years ago I suddenly developed diabetes insipidus and at the same time was diagnosed with thyroid cancer. My thyroid was removed and have undergone 3 radiation treatments. However, the reason for my diabetes insipidus is unknown and apparently this can happen?! I was wondering if anyone else has experienced anything similar? Also, my weight increased rapidly after the development of the DI and the cancer and was wondering if any other DI patients have experienced the same?