what arm should i take my blood pressure on..i took mine on my left arm  and it was 120/63..i am a 59 yr. old female and i am not exercising at the present time..is my pressure good..sometimes i may feel a slight dizziness...i am on high blood pills/lisinop/hctz 20-12.5 tab..im 58, 183 lbs.  wasnt diagnose w/ high thyroids but dr. mentioned it.
U can take blood pressure on any arm ...usually blood pressure difference is not more than 10 MMH.maximum people are right and comfortable to take it in right hand ...your pressure seems to be ok...take blood pressure when u feel dizziness.  If same is blood pressure. We may have to look for other cause