This is a case report of a 7-year-old boy who presented with lower limb pain. He was initially presumed to have growing pains but was subsequently diagnosed with acute lymphoblastic leukaemia (ALL). This case highlights the important clinical presentations and differential diagnoses of ALL that a family physician should be cognizant about to avoid misdiagnosis. It also demonstrates the importance of understanding the patient and family's perspectives when evaluating a child with lower limb pain. This enables us to anticipate and meet their needs.