Child’s Knee Pain After Running: Causes & Treatment

Why Does My Child’s Knee Hurt After Running? The answer often depends on where the pain is, when it starts and whether their training load has recently increased. Pain around the kneecap or the bony bump just below it can have different causes, including overuse problems that may occur during growth. A sore knee does not automatically mean your child needs to stop all sport, but it should not be dismissed as “growing pains” either.

It can be difficult to tell ordinary post-exercise soreness from a problem that needs attention. Notice when the pain begins, what makes it worse and whether it affects walking or other activities. This can help you decide whether to adjust training or arrange an assessment.

Why might a child’s knee hurt after running?

A child’s knee pain after running can have several causes. Where the discomfort is, when it starts and what has changed in their activity can offer useful clues, but these details cannot confirm a cause on their own. A sudden increase in running or jumping, such as extra school-sport training, can place greater demands on a growing knee before the child has adapted to the new workload.

Overuse irritation is one possibility, but knee pain can have other causes too. Note whether symptoms begin during a run, afterwards or with a particular movement. Also consider recent changes to distance, intensity, jumping drills or recovery time. These details can help guide an assessment.

What can pain location suggest?

Pain and tenderness at the bony bump just below the kneecap may be associated with Osgood-Schlatter-related irritation, where the patellar tendon attaches to the shin bone. It can occur in active children during growth, particularly with repeated running and jumping. The overview of Osgood-Schlatter disease describes this condition and its common features.

Pain around or behind the kneecap during repeated activity may fit a patellofemoral pain pattern. Symptoms can appear with running, jumping or other repeated knee-bending movements. These patterns can overlap, and pain location alone cannot distinguish between them or rule out other causes. An individual assessment can consider your child’s activity history and how they move. Paediatric Physiotherapy can help build a clearer picture of their needs.

What can parents do when a child’s knee hurts after running?

Look for a pattern rather than trying to identify the cause at home. Record what the pain feels like and what your child was doing when it began. Do not automatically stop all activity, but do not encourage them to keep running through pain either.

1. Note the symptoms. Record where the knee hurts, when discomfort starts and whether it settles after the run or lingers.
2. Review recent training. Look for changes such as extra running sessions, more jumping drills, longer distances or less recovery between activities.
3. Adjust the load. Temporarily reduce or modify running and jumping that reliably provoke pain. Keep comfortable everyday movement, such as walking, if it does not worsen symptoms.
4. Reassess. Notice how the knee responds to the change and whether the same activity still brings symptoms back.

How should you adjust running and sport?

Use your notes to guide a gradual return rather than following a fixed timetable. If running causes pain, your child might take part in less aggravating parts of training while temporarily reducing the distance, intensity or jumping involved. Increase activity in manageable steps only if symptoms remain comfortable during and after exercise. If discomfort returns as activity increases, ease back and consider an assessment.

Load adjustment is a practical starting point, not a substitute for individual advice. The Knee Pain and Knee Injuries in Kids resource outlines different causes and when to seek medical attention. If symptoms keep interrupting sport, an assessment of youth sports injuries can consider your child’s activity demands and movement needs.

When should a child’s knee pain after running be assessed?

Arrange an assessment if the pain persists, keeps returning after runs, worsens, or affects walking, stairs, school activities or sport. A child who regularly avoids using the leg or changes how they walk should also be assessed. You do not need to identify the cause at home. A clinician can consider the pattern alongside your child’s health and activity history.

Seek prompt medical advice for severe or rapidly worsening pain, marked swelling or redness, or if your child cannot put weight on the leg. A hot, swollen knee with fever also needs prompt medical attention. These signs do not point to one diagnosis, but they should not be managed by simply waiting for the next training session.

What might a paediatric assessment consider?

A Paediatric Physiotherapy assessment can review where and when symptoms occur, recent changes in training and relevant medical history. Depending on your child’s needs, the physiotherapist may assess strength, mobility, balance, coordination and movement patterns during activities such as walking, squatting or running. This helps build an individual picture; one symptom alone does not determine a diagnosis.

The first session lasts about 45 minutes and includes a discussion of your child’s history, a physical examination and a management plan. Bring their medical and surgical history, relevant scan or MRI reports, medication list and doctor’s referral letter if available. Be ready to describe when the pain began, what makes it better or worse, and how it affects everyday movement and sport. These details can help guide the assessment and next steps.

Take the next step with confidence

If your child’s knee pain keeps returning or affects their usual activities, an individual assessment can help clarify what may be contributing to it and whether changes to activity or further support could be useful. The aim is to understand your child’s needs and help them stay involved in movement as comfortably as possible.

Benchmark Physio provides Paediatric Physiotherapy using an individualised approach and evidence based care. An assessment can consider your child’s movement, activity demands and symptoms to help plan appropriate next steps.

A clearer understanding can help your family make decisions with greater confidence. Your child’s return to comfortable activity can be approached one step at a time.

Frequently Asked Questions

Is knee pain after running normal for children?

Brief muscle soreness after unfamiliar exercise can happen, but recurring pain focused in the knee should not automatically be dismissed as normal. The cause can vary, so notice whether discomfort is in one spot, affects walking or returns with each run. Pain that persists or interferes with usual activities deserves assessment.

Can my child keep running with knee pain?

Not necessarily at the same pace or distance. If running brings on pain, pause that activity and avoid asking your child to push through it. They may be able to continue comfortable daily movement or an activity that does not provoke symptoms. If pain changes their stride, increases during exercise or is worse afterwards, stop the session and seek advice if it recurs.

How long should a child’s knee pain last after running?

There is no one timeframe that applies to every child, because duration depends on the cause and how the knee responds to changes in activity. Pay attention to whether symptoms are settling, staying the same or getting worse. If pain continues despite reducing aggravating activity, repeatedly returns with running, or affects walking and sport, arrange an assessment rather than relying on a fixed waiting period.

Should I put ice on my child’s knee after running?

A wrapped cold pack may help soothe discomfort after activity, but it will not identify or treat every possible cause. Place a layer of cloth between the pack and skin, and check your child’s skin regularly. Stop if the area becomes unusually numb or uncomfortable. Do not use ice as a reason to resume a run that still causes pain.

Article by

Ng Hong Kai

Hong Kai has been practising musculoskeletal physiotherapy for more than a decade. He is the first Singaporean to achieve dual credentials as both an APA Titled Musculoskeletal Physiotherapist and a tertiary trained Exercise Scientist.

Hong Kai's broad and extensive skillset allows him to create solutions that are simple, effective and tailored to a client’s musculoskeletal needs. His beliefs in continuing education and self improvement led him to complete his Masters in Clinical Physiotherapy (Musculoskeletal), where he had a chance to participate in formal research into knee osteoarthritis under the supervision of world renowned researcher and physiotherapist Prof Peter 0′ Sullivan. Hong Kai has experience treating a variety of musculoskeletal conditions, with a specific focus on addressing lower back, neck, shoulder and knee pain.