This information reflects U.S. guidance; if you live elsewhere, follow local emergency guidance and check with a local pediatrician.
Why It Happens
Nemours KidsHealth is direct about this: doctors don’t actually know what causes growing pains, and despite the name, the pain isn’t linked to bone growth itself, since it doesn’t get worse during growth spurts and doesn’t occur at the growth plates. The most commonly cited explanation is that the aches come from ordinary daytime activity, such as jumping, climbing, and running, with muscle fatigue and minor overuse only becoming noticeable once a child settles down in the evening. Some researchers have also proposed that children with growing pains may simply have a lower pain threshold, making them more likely to notice ordinary muscle aches, while others point to lower bone density in the growing skeleton as a factor that, combined with a child’s activity level, could contribute to an overuse-type pattern.
How It Looks at Different Ages and Stages
Growing pains typically appear somewhere between ages 3 and 12, and Nemours KidsHealth notes they usually start in this range, while several children’s hospitals describe two peak periods, around ages 3 to 5 and again around ages 8 to 12. Episodes tend to come and go, sometimes settling in for a stretch of days or weeks and then disappearing for months before returning.
Home Care
Gently massaging the sore area or applying a warm compress can ease the discomfort, and a warm bath is often suggested as well. HealthyChildren.org cites research showing that daily stretching of the quadriceps, hamstrings, and calf muscles can prevent most growing pains, so building in a regular stretching routine, even on pain-free days, is worth trying. For more intense pain, an age- and weight-appropriate dose of acetaminophen or ibuprofen can help; check the product label or ask a pharmacist or doctor about the right dose. Importantly, children with growing pains don’t need to cut back on their normal daytime activities.
Common Parent Misconceptions
It’s easy to jump to worrying about a serious illness the moment a child complains of leg pain at night, but most of the time the pattern is a textbook case of growing pains: both legs, no problem during the day, and pain in the muscles rather than the joints. On the other end, some parents brush off leg pain as “just growing” without a second look, but Nemours and HealthyChildren.org are both specific that pain limited to one leg, limping, joint swelling or redness, or pain that’s tender to the touch in one specific spot is unlikely to be growing pains and deserves a doctor’s evaluation. Another common misunderstanding is that the pain comes from bones growing quickly, but as noted above, the pain is generally tied to daytime muscle activity rather than the growth process itself.
Signs That Need Medical Care
Pain that keeps happening in just one leg, joint swelling, redness, or warmth, pain that continues during the day, or pain that’s worse in the morning or actually improves with exercise all run counter to the usual growing-pains pattern and are worth having checked. A child who refuses to walk or starts limping, has a fever alongside the leg pain, or has a noticeable lump in the leg should also see a pediatrician. If a child who was walking normally suddenly refuses to bear weight with no injury to explain it, this can be an early sign of conditions such as septic arthritis, juvenile idiopathic arthritis, or, rarely, leukemia, so it’s worth getting evaluated rather than waiting it out. Go to the emergency room right away if leg pain comes with a high fever, if a child cannot put any weight on the leg at all, or if a child suddenly becomes unusually pale, limp, or lethargic. This information isn’t a diagnostic tool and doesn’t replace advice from a medical professional.