Introduction: Growing pains are a common complaint in school age children, but no definite organic causes have been identified. An association between musculoskeletal pain and joint laxity has been proposed. This study therefore investigates the relationship between growing pains and joint hypermobility in children.

Materials and Methods: Thirty three children with growing pains and thirty one controls of similar age and sex were recruited from outpatient clinics of a specialist paediatric hospital. Joint hypermobility was assessed in each group using the Beighton score. A Beighton score of greater than or equal to 4 out of 9 was considered hypermobile.

Results: The median Beighton scores were 6 for the study group and 0 for the control group. 93.3% of the study group had a Beighton score of equal to or greater than 4, compared to 22.6% of the control group. There was a highly significant difference in Beighton score between the two groups (P< 0.0001), with an estimated difference of 4 points 95% CI 4–6.

Discussion and Conclusion: A link between joint hyper-mobility and musculoskeletal symptoms has been demonstrated in adults. There is also some evidence that hypermobile children are more likely to experience musculoskeletal pain, particularly articular, but the extent to which joint hypermobility is related to growing pains specifically has been poorly defined. We have investigated a selective population of children with growing pains and have shown them to be significantly more hypermobile than the control children. The aetiology of growing pains remains unclear. While the growing pains will get better, in view of the possible association of joint hypermobility and other musculoskeletal complains, these children should be carefully assessed for joint laxity.