Complaints & connections · borters.ch
Weals that wander and vanish — usually harmless, often without a findable trigger.
Also known as: urticaria · hives · wheals
Open in the tool — with search and all the links →This compilation is for information and replaces neither medical diagnosis nor treatment. If you have symptoms, see a doctor.
Weals are raised, itchy patches that appear when mast cells in the skin release histamine. Their behaviour is the giveaway: a single weal rarely lasts more than a day, fades without a trace and turns up somewhere else. If it wanders like that, it is urticaria; if one spot stays put beyond twenty-four hours or leaves a mark, it deserves a look, because other causes then come into play. The split is by duration: acute up to six weeks, chronic beyond. The acute form often follows an infection, a medicine or a food. In the chronic form, by contrast, no outside trigger is usually found — in most cases it is a reaction of the body against itself, and the long hunt for the one guilty food is then futile. That is one of the most useful things to know, because it frees many people from an ever-narrowing diet. What does turn up are amplifiers: heat, alcohol, stress, anti-inflammatory painkillers, pressure on the skin. They do not trigger, they lower the threshold. The chronic form often keeps company with thyroid inflammation, which is why TPO antibodies and TSH are among the few worthwhile tests. It usually stops of its own accord, often after months to a few years.
If wheals appear within minutes to two hours after a particular food, together with tingling in the mouth or swelling of lips and eyelids, an allergy is at issue. Hoarseness, cough or difficulty breathing make it urgent.
If a wheal stays in the same spot for more than twenty-four hours, burns rather than itches, or leaves a bruise behind, it is no longer ordinary hives. What lies behind it is an inflammation of the small vessels, treated differently — and shown only by a skin sample taken from a fresh lesion.
TSH and TPO antibodies are among the few tests that can actually change something in chronic urticaria — accompanying thyroid inflammation is common.
Hot showers, alcohol, short sleep, tight waistbands: raising that threshold often pays more than a tenth elimination diet.
A low-histamine diet helps a subgroup. It belongs limited to two or three weeks and then reopened — otherwise a trial becomes a permanent state.
Anti-inflammatory painkillers of the salicylate type can worsen flares. That belongs in a conversation with the doctor, not in stopping on your own.
Two weeks with date, site, duration and what was different the day before. Kept longer it rarely says more and makes the thing bigger than it is.
With chronic hives and no further hints, a search for parasites almost never finds anything. It becomes worthwhile with raised eosinophils, after a stay in the tropics, with diarrhoea or with belly complaints — but then specifically.
The reaction is directed at the worm in the fish, not at the fish. It can be violent and is often classed as fish allergy — the test tells the two apart.
A narrow, strongly itching stripe on the trunk that shifts by centimetres within hours is the sign of a migrating threadworm larva. It returns in bouts over decades. In chronic hives Blastocystis is occasionally found in the stool; whether it explains the weals is open.
Some react to bites from bedbugs or fleas with large weals lasting days, others feel nothing. New weals after every night in the same place are the clue. A sudden, violent reaction without bites can instead come from a leaking dog tapeworm cyst.
Antihistamines occupy the receptor through which histamine raises the weal; in chronic urticaria up to four times the standard dose is used. They suppress the reaction. Most forms stop by themselves after months to years — that is the real message.
A single weal lasts less than twenty-four hours and disappears without a trace — if it stays longer or leaves a mark, another cause is looked for. The acute form lasts up to six weeks, usually a few days. From six weeks it counts as chronic; about one to two in a hundred people have it once in their life. In about half, the chronic form stops by itself within a year.
Raised, red, sharply edged, often paler in the middle. What matters is not the look but the clock: the individual patch is usually gone within hours.
Urticaria itches. If a patch burns or hurts instead and stays for days, that does not fit the picture and needs review.
Deeper swellings feel tight rather than itchy and take longer to settle. Swelling of the tongue or throat, or breathlessness, is an emergency — the one situation where you do not wait.
These amplifiers do not trigger urticaria, they lower the threshold. That is why it seems as though first one thing and then another is to blame.
If you draw a fingernail across the skin and a line rises within minutes, that is dermographism. It is common, harmless, and a good sign of irritable mast cells.
In the chronic form the search for the one food almost never finds anything. Cutting out more and more costs nutrients and pleasure, not weals.
For chronic hives a controlled study measured an improvement at 100 µg (4000 IU) a day over 12 weeks on top of the antihistamine. That amount belongs monitored and is not meant as an unchecked standing dose.
Stabilises in the test tube the mast cells the histamine comes from. In humans this is barely studied, and uptake from the capsule is low — 500 mg twice daily is the usual frame.
The weal arises when mast cells release histamine: vessels become leaky, fluid moves into the tissue, it itches. That a weal disappears within 24 hours and leaves the skin unchanged is part of the definition.
With chronic hives thyroid antibodies are found more often — even with normal function. The link is described; treating the thyroid, though, mostly does not improve the weals.
Cortisone works fast in hives, but it is meant for short bursts. Taken over weeks the reckoning reverses — the side effects overtake the benefit, and the antihistamine at a higher dose is the better route.
Helps a subgroup — use the histamine filter.
In chronic forms a temporary low-histamine diet is tried — as a test over weeks, not permanently.
At the elbow, in TCM the point for “heat in the skin” — the most-named for itch and rash.
Hives that come with warmth and hives that come with cold are two different patterns with two treatments in TCM. In today’s classification it is the same distinction, only named differently.
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