Many children are naturally flexible. Some can easily perform party tricks such as bending their thumbs backwards or sitting comfortably in positions that adults would find difficult. While flexibility can be advantageous in activities such as gymnastics or dance, in some children it reflects joint hypermobility, a condition where joints move beyond the typical range expected for age and development.
Although hypermobility is often harmless, it can sometimes be associated with pain, fatigue, motor coordination difficulties, or recurrent injuries, making early recognition important.
What is joint hypermobility?
Joint hypermobility refers to movement of a joint beyond the normal range of motion for a person’s age, sex, and ethnicity.
Children naturally tend to be more flexible than adults because their connective tissues are still developing. However, when hypermobility is widespread across multiple joints it may be described as generalised joint hypermobility (GJH).
Hypermobility exists on a spectrum. Some children simply have flexible joints with no difficulties, while others develop symptoms that affect daily activities. In certain cases, hypermobility may be part of hypermobility spectrum disorders or connective tissue conditions such as hypermobile Ehlers–Danlos syndrome.
How common is hypermobility in children?
Joint hypermobility is relatively common during childhood. Prevalence estimates vary widely depending on how it is measured, but research suggests that between about 2% and 39% of children demonstrate excessive joint mobility, with higher rates reported in some populations.
Meta-analytic data suggests an overall prevalence of approximately 17% among children and adolescents, with higher rates observed in girls than boys.
Because flexibility tends to decrease with age, some children naturally “grow out of” hypermobility as their connective tissues mature.
Signs that hypermobility may be causing difficulties
Many hypermobile children function well. However, some develop symptoms that may impact participation in everyday activities.
Common signs include:
- Frequent joint pain or “growing pains”
- Fatigue during physical activity
- Poor posture or unusual sitting positions (for example, persistent “W-sitting”)
- Clumsiness or coordination difficulties
- Recurrent sprains, subluxations, or joint instability
- Delays in motor skill development
- Difficulty keeping up with peers in sport or playground activities
Biomechanical studies suggest that ligament laxity can reduce joint stability, which places abnormal stress on joints and may lead to pain, micro-trauma, or injury over time.
In paediatric rheumatology settings, hypermobility is frequently identified as a mechanical contributor to symptoms such as recurrent limb pain, knee pain, and back pain in children.
Why early identification matters
Hypermobility can sometimes be overlooked because flexible children may appear physically capable. However, research emphasises the importance of early recognition and management, as appropriate support can reduce pain and help children develop efficient movement patterns.
When hypermobility is associated with symptoms, children may benefit from a multidisciplinary approach, including physiotherapy, occupational therapy, and medical oversight.
The role of paediatric physiotherapy
Evidence suggests that exercise-based therapy, stability training, and education can improve musculoskeletal symptoms associated with hypermobility.
Paediatric physiotherapists typically focus on:
- Strengthening muscles to support joint stability
- Improving posture and movement patterns
- Developing motor coordination and endurance
- Educating children and families about joint protection
- Supporting participation in sport and physical activity
These interventions aim to build joint stability and functional movement, helping children remain active while reducing discomfort or injury risk.
When should a child be assessed?
A specialist paediatric physiotherapy review may be helpful if a child with noticeable flexibility also experiences:
- Persistent joint or limb pain
- Frequent injuries or sprains
- Fatigue with physical activity
- Poor coordination or motor skill delays
- Difficulties participating in sport or play
Assessment does not necessarily mean there is a serious problem. Instead, it can provide families with guidance on safe physical activity, strengthening strategies, and long-term joint health.
Supporting flexible bodies
Flexibility is not inherently a problem, and many hypermobile children thrive in physical activities that value range of motion. The key is recognising when flexibility is accompanied by instability, pain, or reduced function.
With appropriate support, most children can develop strong, stable movement patterns and remain fully engaged in the activities they enjoy.
