Why is my toddler's foot still swollen and painful weeks after the flu?

This post is a dramatization of a question and answer session experienced by our actual medical reviewers. Please note that this content is for informational purposes only and does not constitute medical advice. Always consult with a qualified healthcare professional for any health concerns or before making any decisions related to your health or treatment.

Q: I'm at my wit's end and so scared for my 2-year-old. 😥 This all began about 2.5 weeks ago after he got over the flu. At first, he was really unsteady on his feet, staggering around, and wouldn't let us touch his calves or feet. A day later, his right leg was totally fine, but he was still guarding his left leg and refused to walk. Then, the swelling started on the top of his left foot and ankle. It’s warm when I touch it, and he still can't put any weight on it.

We've seen two different doctors. Our pediatrician did an X-ray, which was normal. We then went to a children's hospital for a second opinion. They did more X-rays (also normal) and a bunch of blood tests (CBC, ESR, CRP were all fine). We're still waiting on the results for an ANA and a Lyme test. The NP there thinks it might be juvenile idiopathic arthritis but isn't sure. She wants to do an MRI, which means he'd have to be sedated. I'm really nervous about that, especially since he's barely eating. She also kind of dismissed my worries that it could be something like cellulitis or a torn muscle.

Today he spiked a fever, and the swelling looks even worse. He’s clearly in pain. We're giving him Motrin as suggested, but I feel so helpless. Has anyone been through something similar? What could be causing this?

A: It sounds like you're going through a lot, and it’s completely understandable to feel concerned. Based on what you've described, here are a few possibilities to consider:

• Acute Viral Myositis: This can happen after a viral infection like the flu, causing muscle pain in the legs. It often improves on its own in a week or so with rest and ibuprofen (Motrin).

• Juvenile Idiopathic Arthritis (JIA): JIA can cause joint pain and swelling, especially after an illness. Early diagnosis is helpful for managing symptoms.

• Reactive Arthritis or Toxic Synovitis: Both of these can occur after a viral illness and cause temporary joint inflammation, usually resolving within a few weeks. Since it's been 2.5 weeks and your child is still in pain, a follow-up with a specialist could provide more insight. Keeping a log of fever patterns and symptoms might also help your doctor find answers. You’re doing a great job watching over your child, and it’s completely okay to keep asking questions. Your healthcare team is there to support you!

For extra peace of mind and clear guidance when tracking your child's symptoms, the FeverCoach app is always there to help.

iOS - AppStore, Android - Google Play

https://fevercoach.us