cancer

• cancer is caused by uncontrolled cell growth and division
• benign tumours is where the tumour grows until their is no more room. the tumour stays in one place rather than invading other tissues in the body. benign tumours aren't usually dangerous and aren't cancerous
• malignant tumours is where a tumour grows and spreads to neighbouring healthy tissues. cells can break off and spread to other parts of the body by travelling in the bloodstream. the malignant cells then invade healthy tissues elsewhere in the body and form secondary tumours. maligant tumours are dangerous and can be fatal - they are cancerous
• smoking, obesity, UV exposure and viral infection can all increase the risk of cancer