Hi, I've just been diagnosed with hypothyroidism. I'm a 63 year old female and have most of the symptoms. The only thing that I don't understand is that my blood pressure is very low in the morning, but as soon as I get up, it gets very irregular and sometimes goes as high as !70/105, but my pulse stays very low, at between 40 and 55 beats per minutes. Also if I breathe deeply, my B/P does go down, so I don't think that it's heart related. it's probably stress related, as I do feel nervous for no apparent reason most of the time. I am under the impression that low thyroid function causes low blood pressure???