Does Hyperthyroid Diagnosis Equal Higher Breast Cancer Risk?

I take Oroxine 100 micrograms daily-  I have always been a glass half full person however fatigue has been and still is my biggest issue along with itchy dry skin and weight issues!  My maternal grandmother died as a result of thyroid cancer.  I have my blood tests regular to check.  Recently it was sky high however I did have a cold infection which on the next blood tests suggested it was the infection only giving an altered reading!  It drives me nutty!