 [ Symptoms ] who gets crohn is disease [ Disease ] crohn is disease affects men and women equally and seems to run in some families about 20 of people with crohn is disease have a blood relative with some form of inflammatory bowel disease most often a brother or sister and sometimes a parent or child crohn is disease can occur in people of all age groups but it is more often diagnosed in people between the ages of 20 and 30 people of jewish heritage have an increased risk of developing crohn is disease and blacks are at decreased risk for developing crohn is disease