A name that is probably wrong
Do Growing Pains Really Come From Growing?
Bones grow at a rate you could never feel, and the aches that carry the name almost certainly come from something else.
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Step 1 of 5
Bones lengthen at plates near their ends.
A layer of cartilage sits near each end, makes new cartilage on one side and turns to bone on the other. The bone grows from there, not in the middle.
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Step 2 of 5
The rate is far too slow to feel.
Even a fast-growing child adds around 6 cm a year — about 17 micrometres a day, roughly a fifth the width of a hair. Nothing could register that.
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Step 3 of 5
And the aches are in the wrong place.
They are typically in muscles — the front of the thigh, the calf, behind the knee — not at the growth plates, and both legs at once.
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Step 4 of 5
They come in the evening after busy days.
The strongest pattern is time, not height: late afternoon and evening, after a day of running about, and gone entirely by morning.
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Step 5 of 5
Overuse fits the evidence far better.
Tired muscles after hard use explain the timing, the location and the fact that rubbing and warmth help — which is what you would do for any muscle ache.
Pain that wakes a child, sticks to one leg, or is still there in the morning does not fit this pattern at all, and is worth a doctor's opinion.
The short version
Bones grow a few micrometres a day, which nobody could feel — so growing pains are real aches with a name that points at the wrong cause.
Try it yourself
Mark a height on a doorframe and check again in a month. A few millimetres is a lot of growing, and nobody feels a millimetre.
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