Yes, hives can be induced by stress and anxiety, which is also called adrenergic urticaria. Adrenergic urticaria can be reproduced by injecting adrenaline into the bloodstream of affected individuals. Adrenergic urticaria is closely related to adrenergic pruritis, or stress-induced itching. I see you are on Lexapro, which may not be addressing your anxiety adequately. Please see your doctor to get your anxiety under control. Once your anxiety is under control, then you may see a decrease in the recurrence of hives.