I don't know if I've always been like this as I've only been taking my temp regularly for a year or so since I noticed this. My temp is generally between 35 and 35.8 degrees. Sometimes it gets into the early 36s and sometimes it dips down to 34.7! I definitely don't have hypothermia (I certainly haven't had it for over a year!). The thermometer I use seems to work fine as everyone else in my family shows a normal temp on it and my son showed 39.9 on there when he was ill recently. The inside of my mouth always feels cold which I thought might be affecting it but it's the same under my armpit. I don't feel cold in myself. I have been feeling off for a long while though. Tiredness, irregular periods, irritability and dizziness. Blood tests showed nothing (full blood count and fsh) but I didn't mention the low body temp as I was going re the irregular periods. Any ideas?