Sometimes, bone tumors are discovered when an x-ray is taken for another reason.

Symptoms of a bone tumor include:

• Bone pain:
• Leg pain (unilateral)
• Knee pain (unilateral)
• Arm pain (unilateral)
• Swelling overlying a bone:
• Leg swelling (unilateral)
• Arm swelling (unilateral)

Bone tumors can cause weakening of the bone. If the bone becomes too weak, the bone can fracture.