Limping or a child not using a limb — when should you worry?

In rare cases, yes. Most childhood limps have simple explanations — muscle soreness, a minor sprain, or growing pains. However, a persistent limp that has no obvious injury, that wakes a child at night, or that comes with swelling around a joint can occasionally indicate a bone tumour such as osteosarcoma or Ewing sarcoma. These are uncommon, but they are important to rule out early. If your child has been limping for more than two weeks without improvement, please see a doctor.

The two most common primary bone tumours in children and teenagers are osteosarcoma and Ewing sarcoma. Osteosarcoma most often affects the knee area — the lower femur or upper tibia — and typically occurs during adolescent growth spurts. Ewing sarcoma can arise in long bones or flat bones including the pelvis and ribs. Both can cause a gradual, painless or mildly painful limp before swelling becomes noticeable. Leukaemia, which starts in bone marrow, can also cause bone pain and reluctance to use a limb.

Evaluation usually begins with a careful physical examination and a simple X-ray of the affected limb. If the X-ray shows any suspicious area, or if symptoms persist despite a normal X-ray, the doctor will typically order an MRI for better soft-tissue detail. Blood tests help check for infection markers and can give early clues about leukaemia. If a bone lesion is found, a biopsy is the only way to confirm whether it is benign or malignant. At CION, every case goes to a tumour board — a group of medical, surgical, and radiation oncologists who review the evidence together before any plan is made.

Morning stiffness that improves through the day is a classic pattern seen in juvenile idiopathic arthritis (JIA), not usually in bone tumours. However, if this has been going on for more than four to six weeks, or if you notice any swelling, warmth, or redness around a joint, a paediatrician assessment is warranted. JIA is treatable but needs a confirmed diagnosis. Pain from bone tumours tends to be persistent rather than time-of-day dependent, and is often described as a deep ache that does not fully go away.

Seek prompt medical advice if: the limp has lasted more than two weeks without any injury as a cause; pain wakes your child from sleep; you can feel or see a lump or swelling near a bone; the child is also running a fever without another explanation; or the child is losing weight or appearing unusually tired. Night pain is a particularly important signal — growing pains typically do not wake children from sleep, but bone tumours often do. Early evaluation does not mean the cause is cancer; it means ruling out the important possibilities quickly.

At CION, a child's case is never reviewed by one doctor alone. Our tumour board brings together paediatric-focused medical oncologists, surgical oncologists, and radiation oncologists who discuss every case together before recommending a path forward. We offer a free first consultation, transparent costs, and a 45-minute detailed appointment — enough time to answer every question a parent has. Our 35+ centres across Telangana and Andhra Pradesh mean a family does not need to travel far for expert care.