Skin, hair & nailsAllergic/immuneICD-10 L50
Urticaria (hives)
Also called: Hives
Itchy, raised welts that appear and fade within 24 hours, caused by histamine release from mast cells.
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Causes
- Allergies (foods, drugs, stings)
- Viral infections
- Physical triggers (cold, pressure, heat)
- Chronic spontaneous urticaria (autoimmune)
Risk factors
- Atopy
- Autoimmune thyroid disease
Symptoms
- Itchy wheals
- Swelling of lips or eyelids (angioedema)
Diagnosis — tests and examinations
- Clinical; allergy testing if a trigger is suspected
Treatment
Medicines and medical treatment
- Non-sedating antihistamines (up to 4× standard dose)
- Short oral steroids for severe flares
- Omalizumab for chronic urticaria
Self-care, home remedies and lifestyle
- Avoid triggers
- Cool compresses
Possible complications
- Anaphylaxis if part of an allergic reaction
Prevention
- Avoid known triggers
Outlook
Acute hives settle in days; chronic urticaria usually resolves within a few years.
When to see a doctor
Call emergency services for swelling of the tongue or throat, or difficulty breathing.
Sources and further reading
These sources cover this condition. They have not been checked against every statement on this page.
Related conditions
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