Cancer occurs whenever one of the cells that make up our tissues and organs starts to multiply uncontrollably. So there are as many types of cancer as there are cells in the body. However, all cancers start in the same way. Normal cell control signals in a normal cell in the body go wrong, resulting in an abnormal cell.
Cells usually divide in a controlled way, but abnormal cells keep on dividing and dividing.
This forms a lump known as a tumour. But a malignant, or cancerous tumour can spread. Tumour can become dangerous if they invade nearby parts of the body and stop them working properly. Cancer is different for everyone and how quickly it spreads will vary from person to person. Nevertheless, a large number of people overcome the disease and go on to lead happy and fulfilling lives.