Extended low grade fever - when is it doctor time?

Dehydration also causes low grade fevers. Given the amount you say you are peeing, I assume that also means you must be drinking a lot, but if not, make sure you are replenishing your fluids. No comment on going to the doctor, just wanted to chime in about possibilities. I am a huge hypochondriac, and sometimes take my temp just for funsies, and when I called my doctor about a similar situation that is what he told me. When I upped my fluid intake for a couple days, down it came.

This is just for educational purposes, since you were already seen by a doctor, but an ear thermometer is not very accurate. If you want an actual reflection of your temperature, you ought to use an oral thermometer. The ear thermometer can be thrown off if you have wax in your ear, for example. From a physician's perspective, also, a fever is generally a temp of 100.5 or greater. Even if a person says their body temp runs lower than 98.6, 98.6 is still a normal temperature, not a fever. A lot of things can increase your temperature to a minimal degree like that, and not all of them are illnesses. For example, stress, travel, medications, exercise, weather, etc. That said, I'm glad you got a diagnosis, and it certainly fits with your urinary symptoms. Get well soon!

After reading all the responses (and more nudging from my husband, pointing to the folks in this question saying "Go!") I decided I'd rather feel silly going to the doctor for a fever that wasn't present at the moment, then get sicker if it turned out to be serious. Preliminary diagnosis is a recurrence of a UTI from a few months ago. I've got some antibiotics, and they're going to do a full urinalysis just in case something else is going on, but the PA isn't expecting anything. So, thanks all!

Go to the doctor. Do it.

Yeah, you just described me with mono - worse yet, I'd get 'normal' every day...and then spike a fever in the evenings. 3-4 day of a fever, max. Day 5/6 off to the doctor.

Autoimmune disorders are notorious for causing these kinds of persistent elevated temperatures but not-quite-fevers. Fatigue as well. Don't know about the peeing. The basic screening test for many autoimmune disorders is the ANA, which is a simple blood test. It can give false positives, and can be positive even when there are no problems or symptoms, so if you do get a positive test, it might not be a big deal. Good luck!

I had a similar problem last year. You could have a abscess tooth. Most people have a lot of pain associated with this but I never did. Low grade (100.4ish) and it was up and down for 2 weeks. Went to the doctor who sent me to the ER because I was dehydrated. 2 bags of fluid and lots of tests later they had no idea. I remembered hearing somewhere that an abscess can cause other weird issues so I scheduled an appointment and sure enough. After a root canal I was almost good as new. I would do doctor and dentist just to be sure.

Allergies can give me a low-grade fever with no other symptoms, just since my immune system is going crazy I guess. My fever usually hovers around 99 or so, and sometimes a fever won't register but my face and head *feel* hot. Seasonal allergies have been getting worse generally, due to climate changes. BUT, if you go to a doctor, I would ask about a white blood cell count. I had a long cold (over a week) and they drew blood to test my white cell count. That would let you and the doctor know if something more serious could be going on.

Go to the doctor. It's been 10 days, you might have something that warrants more tests and/or antibiotics. Primary care, urgent care or clinic. IANAD