health and disease

a state of physical and mental wellbeing

can be passed from person to person, caused by pathogens

cannot be passed from person to person

microorganism that causes disease

a mass of abnormally growing cells

non-cancerous tumour, does not spread around the body, can grow very large very quickly and cause pressure or damage to an organ

cancerous tumour, spreads around the body via the bloodstream or lymphatic stream (secondary tumours), interfere with regular tissue function and may cause death

the spread of cancer cells beyond their original site

cancer-causing substances, cause genetic mutations

asbestos, benzene, cadmium, radon, chemicals in tobacco

can interrupt the cell cycle and cause tumour formation

UV light, gamma rays, X-rays

hepatitis B, hepatitis C, HIV, HPV

treatment of cancer with drugs

treatment using radiation