Types of urticaria

Types of urticaria

By duration - the fundamental split:

• Acute urticaria: lasts under 6 weeks, often just days. Usually has a findable trigger - a viral infection, a new medicine, a food. Most cases of one-off hives are this.
• Chronic urticaria: persists or keeps recurring beyond 6 weeks. Subdivides into:

Chronic spontaneous urticaria (CSU): hives appearing on their own, without an external trigger. The most common chronic form. Frequently autoimmune - the immune system activates its own mast cells. It is not an allergy; searching for "the food" is usually fruitless. It runs a course of months to years and eventually resolves in most people, but needs regular treatment to live comfortably meanwhile.

Inducible (physical) urticarias: hives reliably triggered by a specific physical stimulus:

• Dermographism ("skin writing") - stroking or scratching the skin raises a wheal along the line within minutes; the commonest physical type
• Pressure urticaria - delayed swelling where straps, waistbands or prolonged sitting press the skin
• Cold urticaria - hives on cold exposure (wind, cold water); important because cold-water swimming can trigger massive histamine release - drowning risk
• Cholinergic urticaria - small, intensely itchy bumps with sweating, exercise or hot baths; common in young adults
• Heat, solar and aquagenic (water) urticarias - rarer forms

By accompanying swelling:

• Urticaria with angioedema - deeper swellings of lips, eyelids, tongue or extremities accompany the wheals; raises the stakes because throat swelling is an emergency
• Hereditary angioedema - a different, rare genetic disease (no hives, recurrent swellings, C1-inhibitor deficiency); does not respond to antihistamines and needs specific treatment

Why typing matters to treatment: acute needs trigger-finding and a short antihistamine course; CSU needs regular daily antihistamines for months, sometimes escalating doses; inducible types need trigger avoidance plus prevention dosing.

Remember: under six weeks - hunt the trigger; over six weeks - it is usually the immune system, not your diet. Physical types have their own specific triggers to avoid.

Ayurvedic view (interpretive)

Classical categories of Sheetapitta by dosha describe patterns of presentation; the clinically decisive modern split - duration and inducibility - determines the treatment plan a doctor actually writes.