Growing pains are recurring aches in a child’s legs that typically strike in the late afternoon or evening, often waking kids from sleep. They affect children between the ages of 3 and 12, with a peak around age 6. Somewhere between 3% and 37% of children experience them, depending on how broadly studies define the condition.
What Growing Pains Feel Like
Children describe growing pains as a deep ache or throbbing sensation in both legs. The most common spots are the front of the thighs, the calves, the shins, and behind the knees. The pain is never in the joints themselves. Some children also get belly pain or headaches during an episode.
The timing follows a predictable pattern: pain builds in the late afternoon or evening, peaks at night, and disappears by morning. A child who was limping at bedtime will often run around normally the next day. Episodes come and go unpredictably. Some kids go weeks without any pain, while others have flare-ups several times a week or even daily.
Why They Happen (Despite the Name)
The name is misleading. Growing pains don’t appear to be caused by actual bone growth. The peak age for these pains, around 6 years old, doesn’t align with a child’s fastest growth phases. After more than a century of research, there’s still no single confirmed cause, but several strong theories have emerged.
The most widely supported idea is that growing pains are a local overuse or stress syndrome. Pain tends to show up on days when kids have been especially active, which supports the notion that tired muscles are to blame rather than lengthening bones. Children with growing pains also tend to have extra-flexible joints and altered leg muscle strength. Hypermobile joints may force surrounding muscles to work harder during activity, leading to pain once the child rests.
Another line of research points to a lower pain threshold. When researchers tested children with growing pains, they found these kids had a measurably lower tolerance for pain compared to children without symptoms, and this lower threshold persisted over time. This has led some scientists to describe growing pains as an early childhood pain amplification syndrome, where normal physical stress produces a pain signal that’s turned up louder than usual. Foot mechanics may play a role too. One study found that children whose feet roll inward excessively (overpronation) put extra strain on lower leg muscles, and corrective shoe inserts provided partial relief.
How Growing Pains Are Diagnosed
There is no blood test or scan for growing pains. It is a diagnosis of exclusion, meaning a doctor confirms it by ruling out other causes. When a child’s story fits the classic pattern (bilateral leg pain at night, no pain in the morning, no swelling, normal physical exam), lab work and imaging are usually unnecessary.
If something in the history doesn’t quite fit, a doctor may order X-rays to check for structural problems, infections, or tumors. Blood tests looking for signs of inflammation or immune activity come into play when a systemic illness is suspected. One preliminary finding worth noting: some research has linked growing pains with low vitamin D levels, so a vitamin D check may be part of the workup.
Restless legs syndrome can mimic growing pains closely. Both conditions involve uncomfortable leg sensations that worsen in the evening. The key difference is that restless legs create an urge to move, and moving temporarily relieves the discomfort. Iron and folate deficiencies are associated with restless legs, so distinguishing between the two conditions matters for treatment.
Signs That Point to Something Else
Most childhood leg pain is harmless, but certain features should prompt a closer look. Growing pains don’t cause visible changes to the body. If you notice any of the following, the pain likely has a different source:
- Swelling, redness, or warmth around a joint or along the leg
- Morning stiffness that takes time to loosen up
- Pain in only one leg that stays consistent
- Limping or refusal to bear weight
- Fever, rash, or unusual fatigue
- Pain that worsens steadily over weeks rather than coming and going
Juvenile idiopathic arthritis, for example, causes persistent joint pain with swelling and stiffness, particularly in the morning or after sitting still. Bone infections can cause fever alongside localized pain and swelling. In rare cases, persistent bone pain with fever, bruising, or unexplained fatigue can signal leukemia. None of these look like classic growing pains when examined carefully, which is why the pattern of symptoms matters so much.
What Helps During an Episode
Most children respond well to simple comfort measures at home. Gentle massage of the sore area is often the first thing parents reach for, and it works. Many kids just want to be held or cuddled, which is a perfectly valid form of pain relief at this age.
Heat helps soothe the aching muscles. A warm bath before bed can head off nighttime pain, and a heating pad on a low setting works well when pain strikes. Remove the heating pad once your child falls asleep. For pain that’s strong enough to keep a child awake, acetaminophen or ibuprofen at the appropriate weight-based dose can help. Dosing by weight is more accurate than dosing by age, and giving the wrong amount is one of the most common medication mistakes parents make with children. Children under 2 should not take acetaminophen without guidance from a doctor.
Daytime stretching of the thighs, calves, and hamstrings may reduce the frequency of nighttime episodes. The logic fits with the overuse theory: loosening muscles during the day may prevent them from cramping or aching once a child is still at night. Ask your child’s pediatrician which specific stretches make sense for your child’s age and flexibility.
How Long Growing Pains Last
Individual episodes typically resolve by morning. The broader pattern, however, can last months or years before children outgrow it. Most kids stop having episodes by their early teens. Growing pains don’t cause any lasting damage to bones, joints, or muscles, and they don’t signal a future problem. For the child in the middle of a painful night, though, that’s cold comfort. The good news is that the combination of massage, warmth, stretching, and occasional pain relief handles the vast majority of cases without anything more involved.