Research shows that there is a significant association between chronic urticaria and thyroid autoimmunity. In your case, chronic hives are caused by an underlying health condition so they are improved accordingly.
Build up your immunity. To maintain good health, efficient immune system is the key factor. Eat fresh fruit and vegetables.
Avoid all of these -stress, smoking, excess alcohol, caffeine, seafood, processed food, spicy food, food additives, pesticides, pollution.
Take proper sleep
Do meditation and breathing exercises.