Autoimmune disorders sometimes appear in groups. For some people, they seem to get more than one autoimmune disorder.

I know that autoimmune disorders seem to run in my family on both sides. I have relatives with several allergies (I got that too, allergic to penicillins and shellfish, altho the shellfish allergy seems to be iffy now for some reason) and I've got a few relatives with assorted autoimmune disorders such as diabetes and rheumatoid arthritis.

My aunt told me something about my uncle's heart problem that he died from could have been caused by an autoimmune disorder, I dont remember the whole explanation for it, but if its true, that might explain why my dad has a heart problem now too, just like his little brother had.