Cancer is a term used for a disease that occurs when cells in the body grow in an abnormal and uncontrolled way and have the ability to spread to other parts of the body. The uncontrolled growth of cells causes a lump called a tumour to form. Tumours can be benign or malignant. Benign tumours usually grow slowly and do not spread to other parts of the body.
Benign tumours only become a problem if they grow very large taking up space and affecting the way the body works. Malignant tumours are made up of cancer cells. They are usually faster growing and can destroy tissue and spread to other parts of the body.