Growing Pains: Real, Common and Almost Always Harmless

It happens on cue: bedtime stories are done, the lights are low, and a seven-year-old who spent the entire afternoon sprinting around a soccer field suddenly clutches both shins and dissolves into tears. Twenty minutes of leg-rubbing later, she’s asleep. At breakfast, she’s cartwheeling through the kitchen as if nothing happened.

Parents have been puzzling over this nighttime disappearing act for nearly two centuries — the term “growing pains” first appeared in a French medical text in the 1820s. The label stuck, even though the explanation behind it turned out to be wrong. Bones, it turns out, don’t ache when they lengthen.

What is true: the pain is genuine, it follows a remarkably predictable pattern, and in the overwhelming majority of children it signals nothing at all. Knowing that pattern — and the handful of exceptions worth a doctor’s attention — is what turns a worried midnight into a manageable one.

What are growing pains, really?

Growing pains are the most common cause of recurring limb pain in children, and among the most misnamed conditions in all of pediatrics. The classic picture, described consistently by Mayo Clinic, Cleveland Clinic, and the NHS, looks like this: an aching, cramping, or throbbing sensation in both legs — usually the front of the thighs, the calves, or the area behind the knees — that arrives in the late afternoon, evening, or at night. Some children wake from sleep because of it. By morning, the pain has vanished completely.

Two details in that description do most of the diagnostic work. First, the pain lives in muscles, not joints. Knees, ankles, and hips stay normal — no swelling, no redness, no warmth, no stiffness. Second, the pain is bilateral. Both legs ache, even if one bothers the child more on a given night. Pain that consistently favors one leg is, by definition, not a growing pain and deserves a closer look.

The episodes are unpredictable in frequency. Some children have them a few nights in a row and then not again for weeks or months. Intensity varies too, from a mild ache a child mentions in passing to pain strong enough to produce real tears. What never varies in true growing pains is the recovery: the child runs, jumps, and plays normally the next day, with no limp and no lingering tenderness. That complete daytime normalcy is the reassuring signature clinicians look for first.

Do growing pains actually come from growing?

No — and this is the myth most worth retiring. If lengthening bones caused pain, you would expect the aching to peak during growth spurts and to cluster at the growth plates near the joints. Neither happens. As Mayo Clinic points out, there is no evidence that growth hurts, and growing pains don’t track with periods of rapid growth. Adolescence, when growth is fastest, is precisely when growing pains typically disappear.

The location gives the game away, too. Bones grow at the growth plates — the cartilage zones near the ends of long bones, close to the knees, hips, and ankles. Growing pains, by contrast, settle in the muscle bellies of the thigh and calf, well away from where growth actually occurs.

So why does the name persist? Partly habit, partly because it was coined in the 1820s when a growth-based explanation seemed obvious, and partly because no better name has caught on. Some researchers prefer terms like “benign nocturnal limb pains of childhood,” which is more accurate but has the marketing appeal of a tax form.

The practical upshot for parents: don’t try to correlate the aches with height changes on the door frame, and don’t worry that pain-free stretches mean growth has stalled. The two phenomena simply aren’t connected. The name is a historical leftover; the pain is real, but growth is an innocent bystander.

What do growing pains feel like?

Children describe growing pains in strikingly similar language across studies and clinics: aching, throbbing, cramping, or a deep soreness “inside” the leg. It’s a muscular pain, not a sharp or stabbing one, and children usually can’t point to a single spot with one finger — the ache is spread across a region, most often the front of the thighs, the calves, or behind the knees. Some children also report aching in the arms, though leg pain nearly always dominates.

Intensity ranges widely. On mild nights, a child might mention that their legs “feel funny” or “tired.” On rough nights, the pain can wake a child from a sound sleep in tears — which is often the moment parents go from mildly curious to genuinely alarmed. The Cleveland Clinic notes that some children with growing pains also experience headaches or abdominal aches, which supports the theory that these kids may simply process pain signals more intensely overall.

One useful bedside clue: children with growing pains generally welcome touch. Rubbing, massaging, and holding the sore leg brings comfort, and most kids lean into it. Compare that with pain from an injury, infection, or inflamed joint, where a child typically flinches and pulls away from being touched. It’s not a formal diagnostic test, but pediatricians pay attention to it, and it’s something a parent can quietly observe at 10 p.m. without any equipment at all.

What age do growing pains start — and when do they stop?

Growing pains occupy a fairly narrow window of childhood. They typically begin between ages 3 and 5, often ease for a while, and then return between roughly 8 and 12 — the two age bands most sources, including MedlinePlus and the Cleveland Clinic, identify as peaks. Onset before age 3 is unusual, and new-onset “growing pains” in a toddler under 3 or in a teenager should prompt a conversation with a pediatrician rather than a shrug, because the classic pattern doesn’t fit those ages.

The end of the story is the reassuring part: growing pains almost always resolve on their own by the early teen years. There is no residual damage, no weakness, no effect on adult height or bone health. A condition that arrives at night, leaves by morning, and eventually leaves for good is about as benign as recurring pain gets.

A few patterns within that window are worth knowing:

• Girls appear to be affected slightly more often than boys in several studies, though both sexes commonly experience them.
• Episodes tend to be more frequent on days packed with running, jumping, and climbing — a clue to one leading theory about cause.
• Frequency waxes and wanes without obvious reason; weeks of nightly aching can be followed by months of nothing.

If your child’s pain pattern matches the classic picture and they’re in the classic age range, the odds strongly favor a benign course that time will settle on its own.

Why do growing pains happen at night?

The evening timing is one of the most consistent — and, for parents, most unnerving — features of growing pains. A child who was fine at dinner is crying at 9 p.m. Why then?

The most widely accepted explanation is delayed muscle fatigue. During a day of running, jumping, and climbing, a child’s leg muscles work hard. The resulting soreness doesn’t register during play, when adrenaline and distraction are running the show, but surfaces hours later when the body is still and quiet. Anyone who has felt fine leaving the gym and stiff on the couch that evening knows the sensation. Mayo Clinic and the NHS both note that growing pains commonly follow especially active days, which fits this theory neatly.

Nighttime also strips away distraction. A mild ache that a busy child would ignore at noon has the child’s full attention in a dark, silent bedroom. Pain perceived is pain amplified by attention — a well-documented phenomenon at every age.

There’s a subtle diagnostic gift hidden in this timing. Pain that is worst at night and gone by morning points toward growing pains; pain that is present on waking, causes morning stiffness, or produces a limp on the way to breakfast points elsewhere — toward inflammation or injury — and warrants a medical visit. In other words, the clock isn’t just part of the mystery. It’s part of the answer, and it’s one of the first questions a pediatrician will ask.

What actually causes growing pains?

Honest answer: nobody knows for certain. Growing pains have been described in medical literature for nearly 200 years, and the cause remains genuinely unsettled. What the evidence does support is a shortlist of contributing factors rather than a single culprit.

Muscle overuse. The leading candidate. Days heavy with running, climbing, and jumping are followed by more painful nights, suggesting ordinary muscular fatigue in muscles that are still developing endurance.

A lower pain threshold. Research cited by Mayo Clinic has found that children with growing pains report more headaches and abdominal pain than their peers, hinting that their nervous systems may register discomfort more readily. The legs may simply be where a generally sensitive pain system speaks loudest.

Joint hypermobility. Very flexible, “double-jointed” children appear somewhat more prone to growing pains, possibly because loose joints ask more of the surrounding muscles during play.

Bone strength and vitamin D. Some small studies have reported lower vitamin D levels in children with growing pains, but the evidence is mixed and no causal link has been established. It’s a reasonable topic to raise at a checkup — pediatricians routinely think about vitamin D for other reasons — but not a proven explanation.

What’s been ruled out is nearly as useful as what’s been ruled in: growth itself, structural bone problems, and — in children who fit the classic pattern — arthritis and other inflammatory disease. Uncertainty about mechanism, in this case, coexists comfortably with certainty about outcome: whatever drives the aching, it does no harm and it goes away.

How common are growing pains?

Very. Depending on the study and how strictly “growing pains” is defined, somewhere between 10 and 35 percent of children experience them, and some surveys using looser definitions put the figure closer to 40 percent. Even at the conservative end, that makes growing pains the single most common cause of recurrent musculoskeletal pain in childhood — far ahead of injuries, arthritis, or anything else on the list.

Translate those percentages into everyday terms: in a typical elementary school classroom of 25 children, roughly 3 to 8 of them have had, or will have, growing pains. If your child is rubbing their calves at bedtime, they have plenty of company on the block.

Why does the estimate range so widely? Definitions vary between studies — some count any recurrent limb pain, others require the strict classic pattern of bilateral, non-joint, evening pain with normal mornings. Growing pains also have no lab test or imaging finding, so prevalence depends entirely on what parents and children report. And because episodes come and go, a survey taken in a quiet month can miss children who ached nightly two months earlier.

The sheer commonness matters for perspective. Rare symptoms in children reasonably raise a parent’s antennae. Growing pains are the opposite of rare — they’re a routine feature of childhood, familiar to every pediatrician, and their frequency is one more reason clinicians approach the classic presentation with calm rather than alarm. Common, patterned, and self-resolving is a comforting combination.

How do doctors diagnose growing pains?

There is no blood test, scan, or scope that confirms growing pains. The diagnosis is made by pattern recognition — and, when needed, by ruling other things out. Clinicians call this a “diagnosis of exclusion,” which sounds ominous but in practice usually means a careful conversation and a hands-on exam, nothing more.

Expect the pediatrician to ask where the pain is, whether it affects one leg or both, what time of day it strikes, whether it involves the joints, whether the child limps or is stiff in the morning, and whether there’s been fever, rash, swelling, appetite change, or weight loss. Then comes a physical exam: pressing along the bones, moving the hips, knees, and ankles, watching the child walk. In classic growing pains, every bit of that exam is normal — which is exactly the point.

When the story and the exam both fit, Mayo Clinic notes that no testing is typically needed. Tests enter the picture only when something doesn’t fit: one-sided pain, joint involvement, daytime symptoms, systemic signs like fever or fatigue, or an exam finding such as tenderness over a single spot on a bone. In those cases a doctor may order blood work or an X-ray, not because growing pains show up on them — they don’t — but to check for the conditions that mimic them.

For parents, the preparation is simple and genuinely helpful: keep a brief note of when episodes happen, which legs hurt, how long the pain lasts, and what the day looked like beforehand. A week of scribbled observations often tells a pediatrician more than any test.

What conditions can look like growing pains?

Most nighttime leg aches in children are exactly what they seem. Still, a handful of conditions can masquerade as growing pains early on, and each announces itself with features the classic pattern lacks. This is where a comparison genuinely helps:

Condition	How it differs from growing pains
Injury or stress fracture	Pain in one leg, at one specific spot, worse with activity; often a limp
Juvenile idiopathic arthritis	Joint swelling, warmth, or morning stiffness; symptoms present during the day
Osgood-Schlatter disease	Tenderness at a specific bump below one or both kneecaps, worse with sports; typically ages 10–15
Bone or joint infection	Fever, one-sided pain, refusal to bear weight, a child who seems ill
Restless legs syndrome	An urge to move the legs with crawling or tingling sensations, relieved by movement rather than by rest and rubbing
Vitamin D deficiency	Diffuse bone or muscle aches that persist into the daytime; identified by a blood test

Notice the recurring themes in the right-hand column: one-sidedness, daytime symptoms, joint involvement, fever, and a specific tender spot. Growing pains have none of these. Very rarely, persistent bone pain in a child can signal something serious such as a blood or bone disorder, which is precisely why doctors take atypical patterns seriously — and why the classic pattern, once confirmed, is so reassuring. The mimics are uncommon; the point of knowing them is not to fear them but to recognize when the story has stopped sounding like growing pains.

When should you see a doctor about your child's leg pain?

Most growing pains never need a medical visit. But certain features fall outside the benign pattern, and those are the ones worth a call or an appointment. Contact your child’s doctor if the pain:

• Consistently affects only one leg, or centers on one specific spot
• Involves a joint — with swelling, redness, warmth, or stiffness in a knee, ankle, or hip
• Is still present in the morning, or causes morning stiffness or a limp
• Persists during the day or interferes with walking, play, or sports
• Follows an injury, or comes with tenderness when you press on the bone
• Arrives with fever, rash, unusual fatigue, loss of appetite, or weight loss
• Is severe, worsening over time, or associated with weakness
• Begins in a child under 3 or arises newly in a teenager

None of these automatically signals something serious — a limp after a playground tumble is usually just a playground tumble. But each one breaks the growing-pains pattern, and pattern-breaks are what pediatricians want to hear about. Mayo Clinic and the NHS list essentially this same set of red flags, and for the same reason: growing pains are diagnosed partly by the absence of these features.

One more situation deserves mention: your own persistent worry. If the pain fits the classic pattern but the episodes are frequent, intense, or wearing down your child’s sleep — or your peace of mind — a checkup is a perfectly good use of everyone’s time. A normal exam from a pediatrician who has examined thousands of aching legs is worth more than a hundred reassuring articles, this one included.

What helps growing pains at home?

The best remedies for growing pains are old-fashioned, hands-on, and backed by every major source on the topic. None requires a prescription; most require only a parent, a warm towel, and fifteen minutes.

Massage. Gently rubbing the aching thighs or calves is the single most reliably comforting measure. Children with growing pains characteristically respond well to touch — many drift back to sleep mid-massage.

Warmth. A warm bath before bed, or a heating pad on a low setting applied to sore muscles for a short period, relaxes tired muscles. Use warmth while your child is awake and supervised; never leave a heating pad on a sleeping child.

Gentle stretching. Easy stretches of the calves, hamstrings, and thighs during the day may reduce nighttime episodes in some children, per Cleveland Clinic guidance. Keep them light and playful, not a regimen.

Medication, when needed. On a rough night, an age-appropriate over-the-counter pain reliever can help. Ask your pediatrician or pharmacist which product suits your child’s age and health, and follow their dosing guidance exactly. One important caution echoed by Mayo Clinic and the NHS: children and teenagers recovering from viral illnesses should not be given aspirin-containing products, because of the risk of a rare but serious condition called Reye’s syndrome.

What doesn’t help: restricting normal play. Activity isn’t damaging anything, and a child who loves soccer shouldn’t lose it to a benign nighttime ache. If particularly intense days reliably produce painful nights, a pre-bed stretch and warm bath on those days is a smarter adjustment than sitting out the fun.

Do growing pains affect sleep — and how do you handle the 2 a.m. wake-up?

Sleep disruption is the real cost of growing pains. The condition damages nothing physically, but a child who wakes crying two or three nights a week — and a parent who wakes with them — pays a genuine toll in lost rest. Fortunately, the middle-of-the-night episode has a fairly reliable script.

Stay calm and matter-of-fact; children calibrate their alarm to yours. Rub the aching muscles firmly but gently — pressure tends to feel better than light stroking. Warmth helps if it’s easy to arrange, though at 2 a.m., hands and a blanket usually suffice. Most episodes settle within 10 to 30 minutes, and children typically fall back asleep quickly once the ache eases, often faster than the parent does.

Reassurance is part of the treatment. School-age children can quietly worry that leg pain means something is wrong with them. Telling a child plainly — “lots of kids get this, it’s your muscles being tired from a big day, and it will be gone in the morning” — is accurate, and accuracy is soothing. Naming the thing shrinks it.

If wake-ups become frequent, look at the daytime side of the ledger. A consistent bedtime, a wind-down routine, a warm bath on heavy-activity days, and gentle evening stretches may reduce episode frequency. And if disrupted sleep is leaving your child tired, irritable, or struggling at school, mention it to the pediatrician even when the pain pattern is classic — sleep matters enough in childhood that persistent disruption deserves its own attention, whatever the cause.

Are growing pains related to restless legs syndrome?

Possibly — the two conditions are neighbors, and researchers are still mapping the property line. Both produce nighttime leg discomfort in otherwise healthy children, both run in families, and studies have found that children with restless legs syndrome (RLS) are more likely to have been labeled with “growing pains,” and vice versa. Mayo Clinic notes the overlap directly, and some children genuinely have both.

The distinction lies in the character of the discomfort and what relieves it. Growing pains are an ache or throb that improves with rest, rubbing, and warmth — the child wants to lie still and be massaged. RLS, by contrast, is dominated by an urge to move: children describe crawling, tingling, itching, or “fizzy” sensations in the legs that get worse with stillness and better with movement. A child with RLS kicks, shifts, and wants to walk around; a child with growing pains wants a parent’s hands and a blanket.

A few practical pointers for parents trying to tell them apart:

• Ask your child to describe the feeling in their own words — “hurts” versus “my legs feel like they have to move” points in different directions.
• Notice what helps: massage and rest favor growing pains; getting up and moving favors RLS.
• Mention any family history of restless legs to your pediatrician, since RLS is strongly hereditary.

Why does the distinction matter if both are benign? Because RLS can meaningfully fragment sleep and sometimes has identifiable, addressable contributors, such as low iron stores, that a doctor can check for. If the “growing pains” story includes an irresistible urge to move, it’s worth saying so out loud at the next checkup.

Will my child outgrow growing pains?

Yes — and that’s the ending this story reliably earns. Growing pains fade as childhood does, almost always resolving by the early-to-mid teen years. They leave nothing behind: no joint damage, no weakness, no effect on height, athletic ability, or adult bone health. Follow-up of children with classic growing pains consistently shows normal outcomes, which is why every major medical source describes the condition with words like “harmless” and “benign.”

The path out isn’t always a straight line. Episodes typically become less frequent and less intense over months to years, with long quiet stretches interrupted by the occasional bad night, often after an unusually active day. A pain-free six months followed by a rough week doesn’t mean anything has changed — it means the condition is doing what it always does, which is come and go on its own erratic schedule until it stops coming at all.

Do these children grow into adults with more aches? There’s no evidence that growing pains predict adult pain conditions, arthritis, or anything else down the road. Some adults do get harmless nocturnal leg cramps — a different phenomenon with its own mechanics — but childhood growing pains don’t earn anyone a ticket to them.

If there’s one idea worth keeping from this whole article, it’s this: the classic pattern is your friend. Both legs, muscles not joints, evening and night, gone by morning, a child who plays normally all day. When that pattern holds, the evidence says you’re looking at one of childhood’s most common and most temporary complaints — real enough to deserve a warm bath and a leg rub, and harmless enough to deserve nothing more.

Frequently asked questions

Are growing pains a real medical condition?

Yes. Growing pains are a recognized pediatric condition described in medical literature since the 1820s and covered by every major medical institution. The pain is genuine muscle aching, typically in both legs during the evening or night. What isn’t real is the implied cause — growth itself doesn’t hurt. The name is a historical leftover, but the discomfort children feel, sometimes intense enough to wake them from sleep, is entirely real.

At what age do growing pains usually happen?

Growing pains most often occur between ages 3 and 12, with two peaks: preschoolers around 3 to 5, and school-age children around 8 to 12. They almost always fade by the early teen years. New leg pain in a child under 3, or pain that first appears in adolescence, falls outside the typical pattern and is worth discussing with a pediatrician rather than assuming it’s growing pains.

Why do growing pains only happen at night?

The leading explanation is delayed muscle fatigue: leg muscles worked hard during a day of running and climbing, and the soreness surfaces hours later when the child is still and undistracted. Nighttime quiet also amplifies attention to mild discomfort. The timing is diagnostically useful — pain that peaks at night and vanishes by morning fits growing pains, while pain present on waking or causing morning stiffness points to other causes.

Do growing pains happen in the arms too?

Occasionally, yes. Some children with growing pains report aching in their arms as well as their legs, though leg pain — in the thighs, calves, or behind the knees — is by far the dominant feature. Arm pain alone, without the classic bilateral leg pattern, doesn’t fit the growing-pains picture and should be evaluated by a doctor, especially if it affects one arm or involves a joint.

Can growing pains happen every night?

They can occur on consecutive nights, especially after very active days, but nightly pain for weeks on end is unusual and worth a pediatric visit even if the pattern otherwise fits. Typical growing pains come and go irregularly — a few nights in a row, then quiet stretches lasting weeks or months. Frequent episodes that disrupt sleep deserve medical attention both to confirm the diagnosis and to protect your child’s rest.

How can I tell growing pains from something serious?

Look for the classic pattern: both legs, muscles rather than joints, evening or nighttime onset, and a completely normal child by morning. Warning signs that break the pattern include pain in only one leg, joint swelling or redness, a limp, morning stiffness, fever, fatigue, weight loss, or pain tied to an injury. Any of those features means the pain should be evaluated by a doctor rather than attributed to growing pains.

Should I give my child medicine for growing pains?

Usually massage, warmth, and reassurance are enough, but on a particularly painful night an age-appropriate over-the-counter pain reliever can help. Ask your pediatrician or pharmacist which option suits your child’s age and health, and follow their dosing guidance precisely. Importantly, children and teens recovering from viral illnesses should not receive aspirin-containing products because of the risk of Reye’s syndrome, a rare but serious condition.

Are growing pains caused by vitamin D deficiency?

The evidence doesn’t support a clear causal link. A few small studies have reported lower vitamin D levels in some children with growing pains, but findings are mixed and no deficiency has been proven to cause the condition. Vitamin D deficiency can independently cause bone and muscle aches, which is one reason a doctor may check levels if leg pain persists during the day or otherwise falls outside the classic nighttime pattern.

Do growing pains run in families?

There does appear to be a familial tendency. Parents who had growing pains as children often report the same pattern in their kids, and related nighttime leg conditions such as restless legs syndrome are strongly hereditary. Family history doesn’t change management — the condition remains harmless and self-resolving — but it can be reassuring context, and a family history of restless legs is worth mentioning to your pediatrician.

Will growing pains affect my child's growth or sports later on?

No. Growing pains cause no damage to muscles, bones, joints, or growth plates, and they have no effect on final height, athletic development, or adult bone health. Children with growing pains should continue normal play and sports — activity isn’t harming anything, even if very active days sometimes lead to achier nights. The condition resolves on its own, typically by the early teen years, and leaves nothing behind.

References

• NHS — Growing pains
• MedlinePlus — Growing pains

This article is for general information only and is not a substitute for professional medical advice. Please consult a qualified doctor about your individual situation.