My uncle has Crohn's disease and he says it can be painful at times.
Crohn's disease causes abdominal cramps and pain that can come and go and when the persons inflammatory bowel disease flares up the pain can become worse.
Crohn's disease although can sometimes be painful especially when it flares up it's usually not a serious condition unless someone gets other infections.
As long as you continue to take the medications prescribed by your doctor for the Crohn's disease the person should be just fine but experience pain at times.