Most childhood leg aches are harmless, but certain pain patterns warrant medical assessment. A child complaining of aching legs can leave parents wondering whether the discomfort is simply part of growing up. Growing pains are common in childhood, but the term can sometimes be used too broadly to describe pain that has not yet been properly assessed.

Typical growing pains are generally intermittent, affect both legs and occur in the muscles rather than the joints. They commonly appear in the late afternoon or evening, often disappearing by morning, with the child otherwise able to walk and play normally.

However, persistent pain, swelling, limping or symptoms affecting only one leg can point towards another condition and should not simply be dismissed as growing pains.

What do Growing Pains Actually Feel Like?

Despite the name, there is no clear evidence that growing pains are directly caused by bones growing rapidly. Researchers have proposed several explanations, but the underlying cause remains uncertain.

The pain typically:

  • Occurs in both legs. It may affect the thighs, calves or areas behind the knees.
  • Appears later in the day. Episodes commonly develop in the evening or at night.
  • Comes and goes. Children can have completely pain-free periods between episodes.
  • Does not cause limping. Children generally return to normal activity once the episode passes.
  • Does not cause visible inflammation. Swelling, redness or warmth are not typical features.

A child may wake during the night because of the discomfort but appear completely well the following morning.

When is Leg Pain Less Typical of Growing Pains?

Parents should be more cautious when a child's symptoms do not follow the usual pattern.

Pain that is persistent, worsening or concentrated in one leg deserves medical assessment. The same applies when discomfort is present in the morning or during the day and interferes with walking, running or school activities.

Other warning signs include:

  • Swelling, redness or warmth. These may indicate inflammation, infection or injury.
  • Joint pain or stiffness. Growing pains typically affect muscles rather than joints.
  • Limping. Difficulty walking is not characteristic of uncomplicated growing pains.
  • Fever or unexplained weight loss. These systemic symptoms need medical evaluation.
  • Unusual tiredness or weakness. Particularly when occurring alongside persistent pain.

A physical examination is important because several conditions can cause leg pain in children, ranging from minor injuries to inflammatory, infectious or orthopaedic problems.

What Does New Research say About Growing Pains?

A recent case-control study published in the Journal of Children's Orthopaedics examined potential lifestyle-related factors associated with growing pains.

Researchers Ruoyi Guo, Weili Xiang, Hanjie Zhuang, Yiwei Wang and Pengfei Zheng, from the Department of Orthopaedic Surgery at the Children's Hospital of Nanjing Medical University in Nanjing, China, studied 290 children diagnosed with growing pains and 467 age-matched healthy children.

The researchers reported that near-daily maternal exposure to smoking during pregnancy, taking 30 to 60 minutes to fall asleep and becoming extremely tired after exercise were independently associated with a higher prevalence of growing pains. Meanwhile, participation in sports and a preference for legumes were associated with lower prevalence.

Importantly, the findings show associations rather than proof that these factors cause growing pains. The study relied partly on parental questionnaires, so the results should not be interpreted as evidence that a particular lifestyle factor will determine whether an individual child develops the condition.

Could Exercise be Causing my Child's Leg Pain?

Physical activity can sometimes be associated with episodes of childhood leg pain, but that does not mean parents should restrict normal exercise.

In the recent study, extreme fatigue following exercise was associated with higher odds of growing pains. The researchers reported an odds ratio of 15.554 for children described as very tired after exercise, although the confidence interval was wide, reflecting uncertainty around the estimate.

Regular physical activity remains important for children's health. The study itself found that having a preference for sports was associated with lower odds of growing pains.

The practical message is not to stop children exercising, but to ensure they have adequate rest, sleep, nutrition and recovery.

How Can Parents Help With Typical Growing Pains?

When a child has symptoms consistent with uncomplicated growing pains and no warning signs, supportive care may help.

Parents can try:

  • Gentle massage. Rubbing the affected muscles may provide comfort during an episode.
  • Warmth. A warm bath or heat pack wrapped in a towel may help relax sore muscles.
  • Reassurance. Children can become frightened when pain wakes them at night, so calmly explaining that the episode should pass can help.
  • Age-appropriate pain relief. Parents should follow the medicine's instructions and seek advice from a pharmacist or GP if unsure.

If episodes are frequent, keeping a simple diary can also be useful. Record when the pain occurs, which leg is affected, how long it lasts and whether there are symptoms such as fever, swelling or limping.

Could Leg Pain Indicate Vitamin Deficiency?

Parents sometimes wonder whether growing pains mean their child needs extra calcium or vitamin D.

The relationship between nutrition and growing pains remains uncertain. The recent study reported that some children had received calcium or vitamin D supplements before or after seeking medical care, but this does not demonstrate that supplementation treats or prevents growing pains.

Parents should avoid giving children high-dose supplements without professional advice. If a GP suspects a nutritional deficiency, they can determine whether testing or supplementation is appropriate.

When Should Parents Contact a GP?

A GP appointment is appropriate if leg pain is frequent, persistent, worsening or affecting a child's normal activities.

Parents should particularly seek medical advice if their child has pain in one leg, morning pain, joint swelling, persistent stiffness, limping or reduced movement.

A doctor may ask about the location and timing of the pain and examine the child's joints, muscles and walking pattern. Further tests are not necessarily required for classic growing pains, but blood tests or imaging may be considered when symptoms are unusual.

When is Leg Pain an Emergency?

Severe leg pain accompanied by a child appearing seriously unwell requires prompt medical attention.

Urgent assessment is particularly important if pain occurs with high fever, significant swelling or redness, inability to walk, severe weakness, a major injury or rapidly worsening symptoms.

Parents should also seek medical advice when unexplained pain is accompanied by symptoms such as persistent fever, unexplained weight loss, night sweats, unusual bruising or marked fatigue.

These symptoms do not automatically mean a child has a serious illness, but they should not be attributed to "growing pains" without assessment.

Medical Assessment is Needed For Serious Cases

Growing pains are a common cause of childhood leg discomfort and are usually harmless. The classic pattern is intermittent pain in both legs, typically occurring in the evening or at night, without swelling, limping or reduced mobility.

But not every childhood leg ache is a growing pain. Persistent or one-sided pain, morning symptoms, joint swelling, limping or systemic symptoms should prompt a medical assessment.

The latest research adds to understanding of factors associated with growing pains, but more research is needed to establish why some children experience them and others do not.

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Frequently Asked Questions

  • What are growing pains?
    Growing pains are intermittent leg pains in children, typically occurring in the evening or at night, affecting both legs without swelling or limping.
  • When should I seek medical advice for my child's leg pain?
    Seek medical advice if the pain is persistent, affects one leg, occurs in the morning, or is accompanied by swelling, limping, or systemic symptoms.
  • Can exercise cause growing pains?
    While exercise can be associated with leg pain episodes, it is important for children's health. Ensure adequate rest and nutrition to manage fatigue.
  • Do growing pains indicate a vitamin deficiency?
    The relationship between nutrition and growing pains is uncertain. Avoid high-dose supplements without professional advice.