What 'growing pains' actually means
The term is used loosely to mean any ache in a growing child, but as a clinical entity growing pains describes a specific benign pattern: deep aching in the muscles of both legs - thighs, calves, behind the knees - in the late evening or waking a child from sleep, resolving by morning, with no limp and no tenderness to touch.
It typically affects children aged 3–12, is not linked to activity level in any consistent way, and responds to reassurance, massage and simple analgesia. The growth plate itself is not involved, despite the name.
What growth plate injuries look like instead
- Pain is linked to activity: worse during and after sport, better with a couple of quiet days.
- The child can point to one exact spot - a bump, a tendon attachment, a heel.
- That spot is tender when you press it.
- It is often one-sided, or worse on one side.
- There may be a limp after games, and stiffness first thing in the morning.
Side by side
Growing pains: both legs, muscles, evening and night, no tenderness, no limp, unrelated to how much sport was played that day, gone by morning.
Growth plate injury: one side more than the other, at a specific attachment point, worse with and after sport, tender to touch, sometimes a limp, and a clear relationship with training volume.
If the pattern matches the second description, the useful next step is load management and strengthening, not waiting.
Why the distinction matters
Both are benign and both resolve with maturity, so it can seem academic. It is not. Growing pains need reassurance and nothing more. Growth plate irritation needs the weekly training load adjusted and the relevant muscles strengthened - and left unmanaged it can cost a young athlete a season of enjoyment and confidence, even though the tissue itself is never in danger.
Red flags that are neither
These features do not fit either picture and should be assessed promptly by a GP or paediatric clinician.
- Pain that consistently wakes a child at night and is not relieved by simple measures.
- Pain in one specific bone that is worsening week on week.
- Swelling, redness or warmth over a joint.
- Fever, night sweats, unexplained weight loss, fatigue or looking generally unwell.
- A limp with no clear sporting cause.
- Back pain in a young child, or back pain with any neurological symptoms.
What to do while you work it out
Keep a simple two-week diary: what activity was done, and what the pain was like that evening and the next morning. If pain tracks the activity, you are dealing with load. If it appears on quiet days and disappears on busy ones, you are probably not.
That diary is also the single most useful thing you can bring to a first appointment.