How early can bone cancer be diagnosed? what are early symptoms?

By early visit: During routine visit to the doctor after examination may order an x ray based on complaint of slight pain or minimum swelling.

Not 1 disease: Bone cancer is not just 1 disease. Most bone cancers arise from another site in the body. Bone marrow cancers are different. Bone cancers usually present with pain. Bone marrow cancers can present in many ways, and are frequently associated with blood test abnormalities. Does this answer your question?

Vary with type of ca: Some bone cancers cause pain and swelling, others may be silent in the early stages. There are too many different types of bone cancers to provide one answer to the question.