Bone metastasis occurs when cancer cells spread from their original site to the bones. This process can happen with various types of cancer, including breast cancer, prostate cancer, and lung cancer. Once in the bones, these cancer cells can disrupt normal bone function, leading to pain, fractures, and other complications. The most commonly affected bones include the spine, pelvis, and ribs. Symptoms of bone metastasis may include localized pain, swelling, and decreased mobility. Treatment options often involve pain management, radiation therapy, and medications to strengthen bones, aiming to improve quality of life for affected individuals.