Hello,
Thank you for your query at DoctorSpring.com

I can understand your concerns. They are definitely valid. In fact, it is important for parents to recognise these subtle pointers. It is definitely not normal for a six year old to develop fever so frequently.
In such cases, we may need to consider the following:
1. Is the infectious organism hiding in a sanctuary site and emerging from within? Children could be having a sinusitis- inflammation involving the sinus cavities of the face. This could flare up intermittently with URI symptoms
2. Is the child at risk for catching these viral infections repeatedly? Children with primary or secondary immunodeficiency can have such frequent upper respiratory tract infections. Combined variable immunodeficiency classically presents with recurrent minor infections.
3. Is the child having a non infectious cause mimicking an infection? Children with allergic rhinitis or sinusitis can have upper respiratory tract symptoms with low grade fever or none at all. A leukaemia could present with only prolonged fever but there would be other symptoms and the fever would be persistent.
It is important that your child gets evaluated for sinusitis, primary or secondary immunodeficiency. If the fever persists, a formal evaluation in the lines of PYREXIA OF UNKNOWN ORIGIN.
Regards
Dr. Saptharishi