It refers to the development of secondary tumors at different locations in the body from the original cancer. Eventually, these tumors interfere with vital body functions, and if left uncontrolled, will prove fatal. The most common areas for metastasis to occur are in the bones, lungs, liver, and central nervous system. Once a cancer has spread to other parts of the body, it is much harder to treat successfully. That's why it is so important to have regular check-ups and cancer screenings.
Early detection is the best protection.