### Surprising Triggers of Chronic Hives Chronic hives, or urticaria, are itchy red welts that persist for at least six weeks and have no known cause. Identifying triggers can help manage the condition. Here are some lesser-known triggers: 1. **Tooth Decay and Infections**: Tooth decay and infections like urinary tract infections and strep throat can trigger chronic hives. Regular dental care is essential. 2. **Exercise**: Sweat from working out can cause hives. Consult your doctor about taking antihistamines before exercise. 3. **Stress**: High stress levels can exacerbate chronic hives. Techniques like mindfulness meditation can help reduce stress. 4. **Artificial Colors and Preservatives**: Food additives can trigger hives. An elimination diet may help identify the culprits. 5. **Daylight**: Sunlight, including UVA and UVB rays, can trigger hives. This is rare but identifiable. 6. **Cold Temperatures**: Cold weather, foods, and swimming pools can cause hives. A simple ice cube test can confirm this trigger. 7. **Autoimmune Diseases**: Conditions like thyroid disease, rheumatoid arthritis, and type 1 diabetes can be linked to chronic hives. Treating the underlying condition may help. Keeping a diary of symptoms can help identify triggers. Even if the cause remains unknown, chronic hives often disappear over time.