cancer

• cancer occurs when changes in a cell cause abnormal or uncontrolled cell growth and divison leading to the formation of tumors
• begnin tumors


  • one area of the body
  • don't spread
  • put pressure on organs, damaging them
• malignant tumors


  • small parts break off and spread in the blood
  • cause secondary tumors
  • difficult to treat
• radiotherapy


  uses radiation to kill cancer cells but can harm healthy cells too
• chemotherapy


  uses chemicals to halt mitosis in rapidly dividing cells; however, since hair cells are also rapidly dividing, it causes hair loss