Heart cancer occurs when diseased cells grow out of control on or near the heart. These cells form a tumor. Cancer that begins in the heart is primary heart cancer. This form of heart cancer is extremely rare and is most often sarcoma, a type of cancer that originates in the soft tissues of the body.
Heart cancer more commonly occurs when cancer cells spread to the heart from cancer in a nearby organ. For example, lung cancer may spread to the heart, causing secondary heart cancer. Cancer that spreads is called metastatic cancer.
This site provides general information. Please talk to your own doctor to make healthcare decisions that are right for you.