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• health is the state of physical and mental wellbeing
• communicable diseases are diseases that can be passed from one person to another, such as measles and malaria
• non communicable diseases are diseases that are not spread from person to person or animals eg: asthma, cancer
• the immune system fight off infection
• factors that effect health:

  • having a good immune system
  • diet
  • stress
  • life situation (access to healthcare, condoms..)
• tumour- a mass of cells
• cancer is caused by uncontrolled cell division and cell growth
• types of tumours: benign and malignant
• benign- tumour grows until there's no more room and stays on one place instead of invading other tissues (not cancerous)
• malignant - tumour grows and spreads to neibouring healthy tissues, dangerous and can be fatal. (cancerous)
• risk factors for cancer:

  • smoking
  • obesity
  • UV exposure
  • viral infection
  • some genes