Bone cancer can be primary bone cancer or secondary bone cancer.

Primary bone cancer starts in the bone; the cancer initially forms in the cells of the bone, while secondary cancer starts elsewhere in the body and spreads to the bone. Examples of primary bone cancer include steosarcoma, Ewing sarcoma, malignant fibrous histiocytoma, and chondrosarcoma.
Primary bone cancer (tumor)

- these can be divided into benign tumors - which can have a neoplastic (abnormal tissue growth), developmental, traumatic, infectious, or inflammatory cause - and cancers.

Examples of benign bone tumors include: osteoma, osteoid osteoma, osteochondroma, osteoblastoma, enchondroma, giant cell tumor of bone, aneurysmal bone cyst, and fibrous dysplasia of bone.

SYMPTOMS
Pain:
Pain in the affected bone is the most common complaint of patients with bone cancer. At first, the pain is not constant. The pain increases with activity and the person might limp if a leg is involved.

Swelling
Swelling in the area of the pain may not occur until weeks later. It might be possible to feel a lump or mass depending on the location of the tumor.

Fractures
Bone cancer can weaken the bone it develops in, but most of the time the bones do not fracture (break). People with a fracture next to or through a bone cancer usually describe sudden severe pain in a limb that had been sore for a few months.
Other symptoms

Cancer in the bones of the spine can press on nerves, leading to numbness and tingling or even weakness.
Cancer can cause weight loss and fatigue. If the cancer spreads to internal organs it may cause other symptoms, too. For exampl

Causes

Being a child or very young adult - most cases of bone cancer occur in children or young adults aged up to 20.

Patients who have received radiation therapy (radiotherapy).

People with a history of Paget's disease.
People with a close relative (parent or sibling) who has/had bone cancer.

Individuals with hereditary renoblastoma - a type of eye cancer that most commonly affects very young children.

People with Li-Fraumeni syndrome - a rare genetic condition.

Babies born with an umbilical hernia.