Medically reviewed by Daniel More, MD Key Takeaways Chronic hives are raised, itchy welts or swelling that last more than six weeks.See a dermatologist if you experience chronic hives.Antihistamines ...

Every year, about 20% of Americans will get hives – those itchy, red bumps or welts that can appear after a day in the garden, taking medication, being bitten by a bug or for no apparent reason at all ...