People with severe chronic spontaneous urticaria (CSU), commonly known as hives, have a substantially higher risk of developing serious autoimmune diseases like rheumatoid arthritis and Sjögren syndrome. A large population-based study presented at the American Academy of Dermatology's 2026 Annual Meeting found that patients with moderate to severe hives face significantly elevated odds of developing multiple autoimmune conditions, suggesting that the severity of hives may serve as an important warning sign for doctors and patients alike .

What Is the Connection Between Severe Hives and Autoimmune Disease?

Researchers analyzed data from nearly 38,000 adults with chronic spontaneous urticaria to understand whether disease severity predicted the development of other autoimmune conditions. The study compared 18,873 patients with moderate to severe CSU (who required treatment with medications like omalizumab, dupilumab, or cyclosporine) against 18,873 matched patients with mild disease who never needed these advanced treatments. After accounting for age, sex, race, and ethnicity, the results revealed striking differences in autoimmune disease risk .

The findings showed that patients with severe hives were significantly more likely to develop three specific autoimmune conditions. Those with moderate to severe CSU had 26% higher odds of developing rheumatoid arthritis, nearly 2.4 times the odds of developing Sjögren syndrome, and nearly double the odds of developing psoriatic arthritis compared to patients with mild hives .

Which Autoimmune Diseases Show the Strongest Connection?

The study identified three autoimmune diseases with statistically significant increased risk in patients with severe hives. Sjögren syndrome showed the strongest association, with patients with moderate to severe CSU facing 2.4 times the risk compared to those with mild disease. Psoriatic arthritis was the second most strongly associated condition, with patients facing nearly double the risk. Rheumatoid arthritis, while still significantly elevated, showed a more modest 26% increase in risk .

Interestingly, the research found no statistically significant differences between severe and mild CSU groups for many other autoimmune conditions. These included:

• Thyroid Conditions: Autoimmune thyroiditis and Graves disease showed no significant difference in risk between the two groups
• Gastrointestinal Diseases: Celiac disease, Crohn disease, and ulcerative colitis did not show statistically significant increased risk
• Systemic Conditions: Systemic lupus erythematosus, systemic sclerosis, and fibromyalgia were not significantly more common in the severe CSU group
• Other Autoimmune Conditions: Type 1 diabetes mellitus, vitiligo, pernicious anemia, and psoriasis alone (without joint involvement) showed no significant association

This selective pattern of risk suggests that severe hives may share specific biological pathways with certain autoimmune diseases rather than indicating a general increase in autoimmune disease susceptibility .

How Should Doctors and Patients Respond to These Findings?

The research team emphasized the clinical importance of these findings for patient care and monitoring. Researchers stated that "this knowledge is important to anticipate the prognosis and disease course of CSU and optimize care management for these patients" . The implication is that doctors treating patients with severe chronic hives should be alert to the possibility of developing rheumatoid arthritis, Sjögren syndrome, or psoriatic arthritis, and may want to monitor patients more closely for early signs of these conditions.

For patients with severe hives, understanding this connection provides valuable context for their health journey. If you have moderate to severe CSU requiring biologic medications or other advanced treatments, discussing your autoimmune disease risk with your dermatologist or rheumatologist could help ensure early detection and intervention if other autoimmune conditions develop. This is particularly important for Sjögren syndrome and psoriatic arthritis, which showed the strongest associations in the study.

The study's large sample size and rigorous methodology, which matched patients across multiple demographic factors, lend credibility to these findings. By examining real-world data from over 37,000 patients, researchers were able to identify patterns that might not be apparent in smaller or more controlled studies. This population-based approach provides practical insight into how these conditions cluster in actual patient populations .

While the exact biological mechanisms linking severe hives to these specific autoimmune diseases remain unclear, the strong statistical associations suggest that underlying immune system dysregulation may contribute to both conditions. Future research may help clarify whether treating severe hives more aggressively could reduce the risk of developing these autoimmune complications, or whether the conditions share common genetic or environmental risk factors.