Hello doctor's and all, My baby is 2 years old and undergone chemotherapy and radiation. After radiation he is facing thyroid problem. His thyroid was upto 51. Doctor prescribed him Thyronorm tablets. Previous week his Thyroid comes normal i.e. 4. But after yesterday test it seems that his thyroid again increase upto 26. Kindly may i know why his thyroid becomes up and down again and again. Any precautions we want to keep with him.