What could be causing my son to have recurring monthly high fevers of 103 to 104 degrees that last for four days, respond only to Meftal P and Crocin, and are linked to high white blood cell counts, high inflammation markers, and swollen glands in his belly, with no other symptoms or weight changes for a year?
Because your son's fevers are highly predictable, last four days, and are linked to high inflammation markers with no weight loss, this pattern strongly points toward a periodic fever syndrome, like PFAPA. It is very reassuring that he is growing well. While Crocin (paracetamol) and Meftal P (mefenamic acid) help manage his symptoms, I highly recommend consulting a pediatric rheumatologist or immunologist. They can guide you toward specific tests and treatments to help prevent these monthly cycles.