<s>[INST] Hi i have just undertaken radio active iodine treatment 8 days ago to treat my graves disease.  I have since just gone back on neomercazole yesterday and today.  I received severe chest pains yesterday in the evening and am receiving the same chest pains again now. Is this common as i have never felt anything like this before? [/INST] Well can't say its normal for patient like your case.Get done consulted by a good doctor,Get done EKG and Chest X-ray soon. </s>