My son is 6 years old, and had a 3 week long viral infection in May 2013- he had a high fever, and severe leg pain from the knee down. Since then, his tonsils have never returned to normal size, and he s had 5 different throat infections. Each time he gets one, he gets a high fever, and its accompanied by the same leg pain in his right leg. He has had blood labs drawn twice, and they all come out normal. What is causing this leg pain? Is there more tests I should be inquiring about? Should I be worried about his tonsils?
Leg pain could be arthralgia and as it is associated with fever and sore throat it could be due to Streptococcal infection which is the causative agent for Rheumatic fever. So my opinion is to do a throat swab culture, blood for CRP, AS title and ESR, X-ray paranasal sinus. For tonsils, to avoid repeated episodes of tonsillitis after a course of antibiotics twice daily gurgle with Betadine gurgle solution will help prevent recurrence.