My 4.5 year old son has had frequent fevers. After the last one, I recalled as many as I could, put them on a calendar, noted a pattern and predicted today's fever 3 weeks ago. No other symptoms. He sleeps when he has the fever, usually it's 100* - 101*. If he actually gets sick with something, his fever spikes to 104.7* Best I can tell this is something called Periodic Fever Syndrome.
Who has experince with this and has advice on where I should start searching?
Sounds to me like an issue with his immune system reacting. I feel like I should start with some allergy tests, see if there's any sensitivities that might be sapping some of his immune strength. He's been checked recently for mono.