Chronic Urticaria

Chronic urticaria is a condition that causes recurring raised, itchy welts called hives. Some people also develop deeper swelling, known as angioedema, around the eyes, lips, hands, feet or other areas. The welts may appear and fade while new ones develop, with episodes continuing or recurring for more than six weeks. This type of chronic hives is also called chronic spontaneous urticaria when no consistent trigger is found.

Individual welts usually fade within 24 hours, although new ones may appear as others disappear. Some people have inducible patterns, such as skin writing (dermatographism), in which rubbing or scratching the skin produces raised lines. These urticaria symptoms do not necessarily mean that the rash is caused by an allergy.

Chronic urticaria develops when mast cells in the skin release histamine and other inflammatory chemicals. This causes nearby blood vessels to widen and leak fluid, leading to itchy welts and sometimes deeper swelling. In chronic spontaneous urticaria, no consistently identifiable external trigger is found in many people, although immune or autoimmune activity may contribute. This is why the causes of urticaria are not always the same as the causes of a typical allergic urticaria rash.

Family history, sex and autoimmune associations are not modifiable risk factors, while avoiding a known physical trigger may be manageable for some people. However, having one of these associations does not mean that someone will develop chronic urticaria. Many people develop hives without a preventable cause.

Angioedema can occur with chronic urticaria and may cause swelling beneath the skin. Swelling of the lips or tongue, throat tightness, trouble breathing or difficulty swallowing is an emergency because it may affect the airway. Seek emergency care immediately if these symptoms occur.

A clinician usually diagnoses chronic urticaria from the history and a skin examination. They may ask when the welts began, how long each welt lasts, whether swelling occurs, what medicines or health conditions are present, and whether symptoms follow pressure, cold, heat, exercise, rubbing or another possible trigger. Photographs can help show fleeting hives, and the clinician may also consider patterns such as dermatographic urticaria.

When testing may help

Treatment plans are individualized according to symptoms, health history and response to earlier treatment. Non-sedating antihistamines are commonly used first, while a clinician may adjust the dose or consider other treatments when symptoms remain uncontrolled. Take medicines only as directed, and ask about sedating antihistamines or other therapies that may affect alertness or interact with your medicines.

Chronic urticaria is usually manageable rather than permanently dangerous, although it can be disruptive and unpredictable. Symptoms may come and go, some people eventually enter remission, and others need treatment for longer periods. A flare does not necessarily mean the condition is getting progressively worse.

Over time, it may help to identify inducible triggers, review how well treatment is working and return for reassessment when symptoms change. Ongoing follow-up can help refine the plan for chronic spontaneous urticaria and improve control of chronic hives.

Schedule a medical appointment if hives last or recur for more than six weeks, disrupt sleep or daily activities, follow a suspected medication reaction, occur with repeated angioedema or do not improve with recommended treatment. A clinician can assess the pattern, review possible triggers and discuss appropriate urticaria treatment. Do not assume that recurring hives are an allergic urticaria rash without an evaluation.