Cancer is a disease caused by the abnormal division of cells. This uncontrolled division of cells then forms a tumour.

Cancer starts in cells in our body. Cells are tiny building blocks that make up the organs and tissues of our bodies. They divide to make new cells in a controlled way. This is how our bodies grow, heal and repair. Cells receive signals from the body telling them when to divide and grow and when to stop growing. When a cell is no longer needed or can’t be repaired, it gets a signal to stop working and die.

What is a tumour?

Cancer develops when the normal workings of a cell go wrong and the cell becomes abnormal. The abnormal cell keeps dividing making more and more abnormal cells. These eventually form a lump (tumour). Not all tumours are cancerous. Doctors can tell if a tumour is cancerous by removing a small sample of tissue or cells from it. This is called a biopsy. The doctors examine the sample under a microscope to look for cancer cells.

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A brain tumour that is cancerous (malignant) can grow into nearby tissue. Cancer cells from the tumour may spread from where the cancer first started to other parts of the brain. Primary brain tumours do not usually spread to other parts of the body. Certain brain tumours may spread to the spinal cord.