01/06/2026
After a viral illness like influenza, some children develop a temporary inflammation of the muscles called benign acute childhood myositis.
It most often affects the calf muscles, which can suddenly become:
* sore
* tight
* and painful to stretch
Because of this, children may start walking on their toes or refuse to put their heels down — not because of a neurological problem, but because their calves feel too painful to stretch normally.
Why does it happen?
After flu (especially influenza B), the body’s immune response can temporarily affect muscle tissue, particularly in the lower legs. This leads to muscle inflammation and stiffness during recovery.
What it looks like:
* Child recovering from flu or a viral illness
* Sudden onset calf pain or stiffness
* Difficulty walking normally / toe-walking
* Often worse in the morning
* Child otherwise alert and improving from the virus
The reassuring part:
This condition is self-limiting and usually resolves within 3–7 days without long-term effects.
When to be cautious:
Always seek medical review if:
* child cannot walk at all
* symptoms are worsening instead of improving
* fever returns or child looks unwell again
* weakness is severe or one-sided
Treatment:
* rest
* hydration
* simple pain relief if needed (as advised by a clinician)
* reassurance (the most important part)
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Bottom line:
Post-flu toe-walking is often not neurological — it can simply be sore calves recovering from a viral myositis that passes quickly.
Have you ever had a toe walker after a flu-like illness?
