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Toddler fevers for a month

My son has had recurrent fevers for a month now. He is 2 1/2 years old. He has been pulled from daycare due to the amount of times he was getting sick. Since he has been home for the past three weeks he has been perfectly healthy, energetic, eating, sleeping well and an overall normal crazy little toddler. We have talked with the pediatrician multiple times and have seen other specialists - Infectious disease doctors, rheumatologist, pulmonologist and ENT (He has tubes for ear infections). He has had a CBC and everything on that looked completely normal by all of the specialists. Going back as far as 1/10/2023 his fevers have been anywhere between 99.6-102. Some of the time they will start around noon but most of the time he will be fine all day and then his fever will start right before bed 6:00-7:00PM. We are at a loss of what else to check and aren't exactly comfortable with the specialists saying that this may just be normal for him. Any information or thoughts would be appreciated.

Info that might be helpful

Age : 2 1/2
90th percentile weight
78th percentile height
2 dogs at home
No harsh chemicals used when cleaning
Well beyond his normal developmental milestones
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973741 tn?1342342773
I understand as a mama that you are concerned and worried. Believe it or not, there is a condition that results recurrent or episodic temperatures (a temp is defined as anything over 100.4 degrees by the way). It's called periodic fever syndrome. Those that have this are usually under 5 and don't have a virus or bacterial infection to be found. Here is info from the Cleveland Clinic on it. https://my.clevelandclinic.org/health/symptoms/21185-recurring-fever .    (copy and paste). It usually follows a pattern of some sort.
Here are the genetic conditions linked to it:

    Familial Mediterranean fever (FMF).
    Tumor necrosis factor receptor associated periodic syndrome (TRAPS).
    Hyperimmunoglobulin D syndrome (HIDA), also called mevalonate kinase associated periodic fever syndrome.
    Neonatal onset multisystem inflammatory disease (NOMID).
    Muckle-Wells syndrome and familial cold auto inflammatory syndrome.
    Periodic fever, Aphthous-stomatitis, Pharyngitis, Adenitis (PFAPA) syndrome.

It should still respond like a regular fever to tylenol or ibuprofen. Drink plenty of fluids, check for hydration.

Most of the time, this goes away as a child ages and by age 5.

NOT sure if this is what is going on but sounds familiar.
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We have looked into the periodic fever syndromes but the rheumatologist and infectious disease specialists have said no to that because in the CBC that he had none of his inflammation markers were elevated.
Okay, so they did cbc and that's normal. It sounds like, to be honest, that you have exhausted medical analysis here and it is not revealing anything that is concerning any of the doctor's you've seen. Remember that a fever is ONLY if it is over 100.4. So, there may be times your child is borderline but it's not really a 'fever'. I keep thinking autoimmune though since the bodies defense system keeps getting triggered to pop a fever. But then it goes away because nothing is there to keep fighting. How does your child act with the actual fevers? I don't really think it sounds like you've missed something since you have done such thorough follow up. What do the doctors say? Not to worry and they will outgrow it?
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