What is the reason for the child's leg pain and high C protein reaction?

Patient's question:

Leg pain, poor appetite, low energy, significant weight loss 10 days ago suspected of growing pains

Doctor's answer:

Medical Analysis: It would be helpful if you could describe your child's condition in more detail. Is the leg pain joint pain or muscle pain? If it is joint pain, which joint is affected, and is it bilateral? This information is crucial for assessing your child's condition. Additionally, has the pain improved after the child received intravenous treatment?
Advice: C-reactive protein is an indicator of inflammation. If your child experiences joint pain along with elevated C-reactive protein levels, and anti-inflammatory treatments are ineffective, it may be necessary to consider the possibility of juvenile idiopathic arthritis.