I'm a 25 year old female and for the past week I've been getting a low grade fever sometimes. It doesn't stay up for long, the longest it's stayed up for is around 50 minutes apart from today it's been an hour and a half but it's only gone up since having a bath. Sometimes it will go up to 37.8 from me just sitting there but after about 5 minutes it goes back down to 37.6/37.7(my thermometer normal range is up to 37.7). It will happen when I've been cleaning too I.e hoovering, tidying etc but once I sit down it'll come down again. The other times it's happened is when I've walked to the shop(it was a warm day) and it went up to 38.2 but within 10 minutes of me sat down it started to lower again. It will probably jump up to 37.8/37.9 a couple, maybe 3 times a day but like I said doesn't last for more than a few minutes, odd time it may go on for half an hour or so but that's probably once in a day, other times it only lasts a few minutes. I've kept a log of my temperature for the last few days and if I add up the length of time it goes up, it's no more than an hour to an hour and a half in a whole day. I never have any issues with it at night time or through the night or even early morning, just purely in the late morning and afternoon time. Is this normal or is this something to worry about? I remember last month one afternoon I felt a bit warm and I took my temperature and it was 37.8 so I don't know if it's just normal for me or if it's something to worry about? I've never felt ill with it, just hot when it happens sometimes. I've had bloods done in the last few weeks which were normal and also had a chest x-ray which was clear(was for another reason) but everything was fine. Is what I'm experiencing just the natural response in body temperature or not? I suffer with really bad health anxiety and googling has not helped! I'm only 25 and I'm fearing I have something bad wrong with me.