Table 2.

Frequency of various autoimmune diseases in CSU

Autoimmune condition	Level of risk
Hashimoto’s thyroiditis	Overt hypothyroidism about 5% although anti-TPO abs can be found between 10 and 20% This figure varies between studies
Pernicious anaemia	5%
Grave’s disease	5%
Vitiligo	5%
Insulin dependent diabetes	> 1%
Coeliac disease	> 1%
Rheumatoid arthritis	> 1%
Polyglandular syndrome with autoimmune thyroid disease, pernicious anaemia and or vitiligo	> 1%
Systemic connective tissue disorders e.g. lupus, MCTD etc.	Same as background population prevalence