This is cancer. The abnormal cells may also spread to other parts of the body and multiply there. Cancer can occur in different parts of the body. In the UK, the most common cancers in men are lung cancer, prostate cancer and colon cancer. The most common cancers in women are breast cancer, lung cancer and colon cancer.
Cancer is the second most common cause of death in the UK - it causes about a quarter of all deaths.
Heart disease is more common. Cancer is more common in older people than in younger people. People who have a family history of a particular cancer are more likely to develop it themselves. Examples are tobacco smoke, diet, alcohol, some chemicals, and many other aspects of lifestyle. Diet is an important factor that may influence the risk of developing some cancers.