Urticaria is characterised by weals (hives) or angioedema (swellings, in 10%) or both (in 40%). There are several types of urticaria. Acute urticarial are when your symptom duration is less than 6 weeks and chronic urticara is when your symptoms are present for longer than 6 weeks with daily episodic weals.
A weal (or wheal) is a superficial skin-coloured or pale skin swelling, usually surrounded by erythema (redness) that lasts anything from a few minutes to 24 hours. Usually very itchy, it may have a burning sensation. Hives are often itchy and can be caused by a reaction to things like food, pollen, insect bites or chemicals. You can usually treat hives with antihistamines from a pharmacy. If it does not get better, a GP may prescribe steroids or stronger antihistamines.
Angioedema is deeper swelling within the skin or mucous membranes and can be skin-coloured or red. It resolves within 72 hours. Angioedema may be itchy or painful but is often asymptomatic. Angioedema may progress to a serious allergic reaction called anaphylaxis, so it is very important to seek medical advice if you develop angioedema.
