So Crohn's disease is an inflammatory bowel disease that can affect any part of the digestive tract, and basically there is so much inflammation within the digestive tract that you can get ulcerations and erosions and wind up developing bloody diarrhea, you can have some pain. Long term you can develop strictures or fistulas, which means you can get tracts from bowel to bowel or bowel to skin.
The management is a little bit tricky but most of the time it's managed with either anti-inflammatory medication such as mesalamine, occasionally during a flair you may need steroids. In advanced diseases you may need to get immune modulator or biologics, such as 6-MP, or Remicade, or Humira. Again, all of that helps to adjust your immunity so that you're able to help manage the Crohn's disease.