I have a 9 year old daughter.  For about 4 weeks now, she says she gets these pains on the lift side in the front. I was just think it could be puberty. But now she has had a headache and a fever between 100 to 101.8 for 3 days now. Should I been concerned Or they may not have anything to do with each other because now she has a sore throat
HelloUnilateral headache in the presence of fever and sore throat can be due to sinusitis. As the duration of headache is long other causes like migraine, poor visual acuity must also be ruled out. I would suggest you to get her clinically evaluated by a pediatrician to find the cause and to assess the need of imaging(like CENT brain) if needed. Regards