Why does osteosarcoma cause persistent bone pain?

Osteosarcoma begins in bone-forming tissue. As the tumour changes the structure of a bone, it can stretch the outer covering of the bone and irritate nearby muscles, nerves, or joints. Pain may start as an ache that comes and goes, then become more noticeable with activity or at night. Swelling, tenderness, reduced movement, or a nearby lump can occur. A weakened area may also be more vulnerable to a fracture. Persistent bone pain has several possible causes, so its presence alone cannot identify osteosarcoma.

Book a medical review for bone pain that persists, worsens, wakes you, or is accompanied by swelling or reduced movement. Tell the clinician where the pain is, when it began, whether activity changes it, and whether there has been an injury. Assessment may include an examination and imaging, followed by specialist tests if a bone lesion needs closer evaluation. Avoid repeatedly stressing a painful area until it has been assessed, particularly if walking or lifting makes the pain worse.

Seek urgent care for sudden severe bone pain after minor force, inability to use an arm or leg, or a visible change in the shape of a limb. Emergency assessment is also appropriate for new severe weakness, numbness, or loss of movement. Prompt review matters when pain is persistent because a weakened bone or another serious condition may need timely treatment.

What could explain this pattern of pain? Do I need an X-ray or another scan? Is the bone safe for normal activity? Should I see an orthopaedic or oncology specialist? What symptoms should prompt urgent contact?