What are the types of Crohn’s disease?

There are five types of the condition, each one affects a different area. The types are as follows:

1. Gastroduodenal Crohn’s disease – This type affects the duodenum (this is the first area of the small intestine) and the stomach. Roughly 5% of those who have Crohn's disease are affected by this type.
2. Jejunoileitis – This type occurs/affects the second area of the small intestine, this is known as the jejunum. Roughly 5% of those who have Crohn's disease are affected by this type.
3. Ileitis – This is known as inflammation in the last portion of the small intestine which is known as the ileum. Roughly 30% of those who have Crohn's disease are affected by this condition.
4. Ileocolitis – This affects the colon and the ileum and is known as the most common kind of Crohn’s disease. Roughly 50% of those who have Crohn's disease are affected by this type.
5. Crohn’s colitis – This is similar to ulcerative colitis as both ulcerative colitis and Crohn’s colitis affect only the colon, however, Crohn’s colitis causes patches of tissue in the lining of the colon that is diseased. Roughly 20% of those who have Crohn's disease are affected by this type.