Primary-care specialists, including pediatricians, internists, and family practice specialists, may treat hives and angioedema. If a severe reaction occurs, an emergency-medicine specialist may treat hives and angioedema. For diagnosis and treatment of allergies over the long-term, an allergist-immunologist is typically involved. It is usually caused by allergy and occurs together with other allergic symptoms and urticaria. It can also occur as a side effect to certain medications, particularly ACE inhibitors. It is characterized by repetitive episodes of swelling, frequently of the face, lips, tongue, limbs, and genitals. Edema of the gastrointestinal mucosa typically. Acute urticaria and/or angioedema are hives or swelling lasting less than 6 weeks. The most common causes are foods, medicines, latex, and infections. The most common causes are foods, medicines, latex, and infections.