... experiencing hair loss, elevated blood pressure & heartrate. I had the nuclear scan done today & was told before I left that the percentage was in a normal range of 15%, but that's all I know, which I'm still very confused. Wondering if I should start taking this medication,PTU, or not?Don't know if that percentage means its working properly & maybe I don't need to take this medication.1 nodule is only 4mm. the others ranging from 1.3 cm. to 2.5 cm. Really could use some input.