New research from the University of Bath shows there is a lack of knowledge about how to treat children in chronic pain.
While around 300,000 adults have been studied as part of trials for the effectiveness of painkilling drugs, only 393 children have been studied.
Children are regularly prescribed drugs to treat chronic pain, despite a lack of evidence they work.
The team behind the study say more research is needed to make sure children get the best treatment.
“Overall, there is no high-quality evidence to help us understand the efficacy or safety of the common drugs used to help children with chronic pain. The lack of data means that we are uncertain about how to optimally manage pain...children and their families all deserve better