what type of cell can stop working and make you ill?

Question: what type of cell can stop working and make you ill?
- Keywords:
  cancer,
  cells,
  health
Asked by demileedoo to Zach on 7 Mar 2014.
- Zach Dixon answered on 7 Mar 2014:
  
  If any type of cell stops working there is a chance of illness.
  
  But luckily we are very tough creatures us humans! Often when cells stop working machines in our body find them and fix them, or make new ones so we stay healthy!
  
  It’s amazing what our bodies can do!

Question: what type of cell can stop working and make you ill?