Risk factors

The two types of AIP occur with different frequency in different parts of the world. In the United States, about 80 percent of people with autoimmune pancreatitis have type 1.

People with type 1 autoimmune pancreatitis often:

• Are over age 60
• Are male

People with type 2 autoimmune pancreatitis:

• Are often over age 40 (one or two decades younger than those with type 1)
• Are as likely to be female as male
• Are more likely to have inflammatory bowel disease, such as ulcerative colitis