Am i more likely than average to have another autoimmune disease?

Yes, if you have one: If you have one autoimmune disease you are more likely than average to have manifestations of other autoimmune disorders.

Maybe: You may be at increased risk of auto_immune diseases if you are a female, have a personal or family history of auto-immune disease or if you live in colder temperate regions. Other factors include viral infections, chemical exposure, and ethnicity.