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Bone cancer is a rare form of cancer that develops in the cells of the bones. It can occur in any bone in the body, but it most commonly affects the pelvis and the long bones of the arms and legs, such as the femur (thigh bone) and humerus (upper arm bone). Bone cancer accounts for less than 1% of all cancers, making it much less common compared to other cancer types. In fact, noncancerous (benign) bone tumors are far more common than malignant bone tumors.
The term bone cancer specifically refers to cancers that originate in the bone tissue itself. It does not include cancers that start in other organs and later spread (metastasize) to the bones. For example, if breast cancer spreads to the bones, it is still classified as breast cancer, not bone cancer. Primary bone cancer, on the other hand, begins directly in the bone tissue.
There are several different types of primary bone cancer, and they vary depending on the type of cells involved. The most common types include osteosarcoma, which usually affects children and young adults and develops in growing bones; chondrosarcoma, which arises from cartilage cells and is more common in adults; and Ewing’s sarcoma, which primarily affects children and adolescents and often involves the pelvis or long bones. Each type behaves differently and requires a specific treatment approach.
The exact cause of bone cancer is not always known, but certain risk factors may increase the likelihood of developing the disease. These include previous radiation therapy, inherited genetic conditions, bone disorders such as Paget’s disease, and a family history of cancer. In some cases, bone cancer may develop without any identifiable risk factors.
Symptoms of bone cancer can vary depending on the location and size of the tumor. The most common symptom is persistent bone pain, which may worsen at night or during physical activity. Other symptoms can include swelling or a lump over the affected area, reduced movement of nearby joints, unexplained fractures, fatigue, and unintended weight loss. Because these symptoms may resemble injuries or other bone conditions, early medical evaluation is important.