Allergies can certainly cause hives. However, not only allergies, but also various autoimmune conditions, can cause hives. Thus, it's very important to consult your doctor for a proper diagnosis. . . . [ Skin Diseases Some amount of stress is a good thing (eustress). But too much of a good thing (sudden acute) or for too long (chronic), can really affect our immune system. And we all know negative stress (distress) Glutathione and Side Effects: What You Need to Know for Better Health Performance Lab